Garmin GTN 625 Manual

Traffic
Terrain
Weather
Procedures
Waypoint Info
Nearest
System
Services
Utilities
GTN 625/635/650
Pilot's Guide
Flight Plan
Map

© 2011-2019
Garmin International, Inc. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated,
downloaded or stored in any storage medium, for any purpose without the express written permission of Garmin.
Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a
hard drive or other electronic storage medium to be viewed for personal use, provided that such electronic or printed
copy of this manual or revision must contain the complete text of this copyright notice and provided further that any
unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
This manual reflects the operation of system software v6.60 or later. Some differences in operation may be observed
when comparing the information in this manual to later software versions.
This part shall comply with Garmin Banned and Restricted Substances document, 001-00211-00.
Garmin
®
, FliteCharts
®
, and SafeTaxi
®
are registered trademarks of Garmin International or its subsidiaries. Garmin
SVT™, Telligence™, and Smart Airspace™ are trademarks of Garmin International or its subsidiaries. These
trademarks may not be used without the express permission of Garmin.
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®
is a registered trademark of Jeppesen, Inc.
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and Stormscope
®
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.
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For information regarding the Aviation Limited Warranty, refer to Garmin's website.
For aviation product support, visit flyGarmin.com.
April 2019 Printed in the U.S.A

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Foreword
Getting
Started
Audio &
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FPL
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Wpt Info
Map
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Terrain
Weather
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Services/
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Utilities
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Messages
Symbols
Appendix
Index
Software License Agreement
BY USING THE DEVICE, COMPONENT OR SYSTEM MANUFACTURED OR SOLD BY GARMIN ("THE
GARMIN PRODUCT"), YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THE FOLLOWING
SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY. Garmin Ltd. and its
subsidiaries ("Garmin") grants you a limited license to use the software embedded in the Garmin Product
(the "Software") in binary executable form in the normal operation of the Garmin Product.Title, ownership
rights, and intellectual property rights in and to the Software remain with Garmin and/or its third-party
providers. You acknowledge that the Software is the property of Garmin and/or its third-party providers
and is protected under the United States of America copyright laws and international copyright treaties.
You further acknowledge that the structure, organization, and code of the Software are valuable trade
secrets of Garmin and/or its third-party providers and that the Software in source code form remains a
valuable trade secret of Garmin and/or its third-party providers. You agree not to reproduce, decompile,
disassemble, modify, reverse assemble, reverse engineer, or reduce to human readable form the Software
or any part thereof or create any derivative works based on the Software. You agree not to export or re-
export the Software to any country in violation of the export control laws of the United States of America.

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Appendix
Index
WARNING: Navigation and terrain separation must NOT be predicated
upon the use of the terrain function.The GTN 6XXTerrain Proximity feature
is NOT intended to be used as a primary reference for terrain avoidance
and does not relieve the pilot from the responsibility of being aware of
surroundings during flight. Terrain Proximity is only to be used as an aid
for terrain avoidance and is not certified for use in applications requiring
a certified terrain awareness system. Terrain data is obtained from third
party sources. Garmin is not able to independently verify the accuracy of
the terrain data.
WARNING: The displayed minimum safe altitudes (MSAs) are only advisory
in nature and should not be relied upon as the sole source of obstacle and
terrain avoidance information.Always refer to current aeronautical charts
for appropriate minimum clearance altitudes.
WARNING: The GTN 6XX has a very high degree of functional integrity.
However, the pilot must recognize that providing monitoring and/or self-
test capability for all conceivable system failures is not practical.Although
unlikely, it may be possible for erroneous operation to occur without a fault
indication shown by the GTN 6XX. It is thus the responsibility of the pilot to
detect such an occurrence by means of cross-checking with all redundant
or correlated information available in the cockpit.
WARNING: The altitude calculated by GPS receivers is geometric height
above Mean Sea Level and could vary significantly from the altitude
displayed by pressure altimeters, such as the output from the GDC 74A/B
Air Data Computer, or other altimeters in aircraft.GPS altitude should never
be used for vertical navigation. Always use pressure altitude displayed by
pressure altimeters in the aircraft.
WARNING: Do not use outdated database information. Databases used
in the GTN 6XX system must be updated regularly in order to ensure that
the information remains current. Pilots using an outdated database do so
entirely at their own risk.
WARNING: Do not use basemap (land and water data) information for
primary navigation. Basemap data is intended only to supplement other
approved navigation data sources and should be considered as an aid to
enhance situational awareness.

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WARNING: Traffic information shown on the GTN 6XX is provided as an
aid in visually acquiring traffic. Pilots must maneuver the aircraft based
only upon ATC guidance or positive visual acquisition of conflicting traffic.
WARNING: Do not use data link weather information for maneuvering in,
near, or around areas of hazardous weather. Information contained within
data link weather products may not accurately depict current weather
conditions.
WARNING: Do not use the indicated data link weather product age to
determine the age of the weather information shown by the data link
weather product. Due to time delays inherent in gathering and processing
weather data for data link transmission, the weather information shown by
the data link weather product may be significantly older than the indicated
weather product age.
WARNING: Never use datalinked weather to attempt to penetrate a
thunderstorm. Both the FAA Advisory Circular, Subject: Thunderstorms,
and the Airman's Information Manual (AIM) recommend avoiding "by at
least 20 miles any thunderstorm identified as severe or giving an intense
radio echo.
WARNING: For safety reasons, GTN 6XX operational procedures must be
learned on the ground.
WARNING: To reduce the risk of unsafe operation, carefully review and
understand all aspects of the GTN 625/635/650 Pilot’s Guide. Thoroughly
practice basic operation prior to actual use. During flight operations,
carefully compare indications from the GTN 6XX to all available navigation
sources, including the information from other NAVAIDs, visual sightings,
charts, etc. For safety purposes, always resolve any discrepancies before
continuing navigation.

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CAUTION: The United States government operates the Global Positioning
System and is solely responsible for its accuracy and maintenance. The
GPS system is subject to changes which could affect the accuracy and
performance of all GPS equipment. Portions of the GTN 6XX utilize GPS
as a precision electronic NAVigation AID (NAVAID). Therefore, as with
all NAVAIDs, information presented by the GTN 6XX can be misused or
misinterpreted and, therefore, become unsafe.
CAUTION: The GTN 6XX does not contain any user-serviceable parts.
Repairs should only be made by an authorized Garmin service center.
Unauthorized repairs or modifications could void both the warranty and
the pilot’s authority to operate this device under FAA/FCC regulations.
CAUTION: The display lens has a special anti-reflective coating that is very
sensitive to skin oils, waxes, and abrasive cleaners. CLEANERS CONTAINING
AMMONIA WILL HARM THE ANTI-REFLECTIVE COATING. It is very important
to clean the lens using a clean, lint-free cloth and an eyeglass lens cleaner
that is specified as safe for anti-reflective coatings.
CAUTION: TFRs provided by datalink weather sources (i.e., FIS-B and
SiriusXM) are only advisory and do not replace a thorough preflight briefing
on TFR times and locations. Not all TFRs may be shown. To determine
accurateTFR information, verify with official sources, i.e., preflight planning
or flight service center.
NOTE: All visual depictions contained within this document, including
screen images of the GTN bezel and displays, are subject to change and
may not reflect the most current GTN software. Depictions of equipment
may differ slightly from the actual equipment.
NOTE: This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
NOTE: This product, its packaging, and its components contain
chemicals known to the State of California to cause cancer, birth
defects, or reproductive harm. This notice is being provided in
accordance with California’s Proposition 65. If you have any questions
or would like additional information, please refer to our website at
www.garmin.com/prop65.

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Appendix
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NOTE: Canadian installations: In accordance with Canadian Radio
Specifications Standard 102 (RSS 102), RF field strength exposure to persons
from an antenna connected to this device should be limited to 60 V/m for
controlled environment and 28 V/m for uncontrolled environment.
NOTE: Do not use SafeTaxi functions as the basis for ground
maneuvering. SafeTaxi functions do not comply with the requirements
of AC 120-76C and are not qualified to be used as an airport moving
map display (AMMD). SafeTaxi is to be used by the flight crew to orient
themselves on the airport surface.
NOTE: The FAA has asked Garmin to remind pilots who fly with Garmin
database-dependent avionics of the following:
• It is the pilot’s responsibility to remain familiar with all FAA regulatory
and advisory guidance and information related to the use of databases in
the National Airspace System.
• Garmin equipment will only recognize and use databases that are
obtained from Garmin or Jeppesen. Databases obtained from Garmin
or Jeppesen are assured compliance with all data quality requirements
(DQRs) by virtue of a Type 2 Letter of Authorization (LOA) from the
FAA. A copy of the Type 2 LOA is available for each database at
flyGarmin.com.
• Use of a current Garmin or Jeppesen database in your Garmin equipment
is required for compliance with established FAA regulatory guidance, but
does not constitute authorization to fly any and all terminal procedures
that may be presented by the system. It is the pilot’s responsibility to
operate in accordance with established AFM(S) and regulatory guidance
or limitations as applicable to the pilot, the aircraft, and installed
equipment.
NOTE: The pilot/operator must review and be familiar with Garmin’s
database exclusion list as discussed in SAIB CE-14-04 to determine what
data may be incomplete. To see if an exclusion report exists for a specific
database, visit flyGarmin.com.

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Appendix
Index
NOTE: The pilot/operator must have access to Garmin and
Jeppesen database alerts and consider their impact on the intended
aircraft operation. For a current list of aviation database alerts,
visit flyGarmin.com.
NOTE: If the pilot/operator wants or needs to adjust the database,
visit flyGarmin.com.
NOTE: Garmin requests the flight crew report any observed discrepancies
related to database information. These discrepancies could come in the
form of an incorrect procedure; incorrectly identified terrain, obstacles and
fixes; or any other displayed item used for navigation or communication
in the air or on the ground. To report an aviation database error,
visit flyGarmin.com.
NOTE: The GTN touchscreen may not respond to touch commands if
condensation or moisture accumulates on the touchscreen.
NOTE: Depending on software version and configuration, GTN features
and screen images may differ from those shown in this manual.

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Terrain
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Nearest
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Appendix
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NOTE: This device complies with Part 15 of
the FCC limits for Class B digital devices. This
equipment generates, uses, and can radiate
radio frequency energy and, if not installed
and used in accordance with the instructions,
may cause harmful interference to radio
communications. Furthermore, there is no
guarantee that interference will not occur in a
particular installation.
If this equipment does cause harmful
interference, the user is encouraged to try
to correct the interference by relocating the
equipment or connecting the equipment to a
different circuit than the affected equipment.
Consult an authorized dealer or other qualified
avionics technician for additional help if these
remedies do not correct the problem.
Operation of this device is subject to the
following conditions: (1) This device may
not cause harmful interference, and (2) this
device must accept any interference received,
including interference that may cause undesired
operation.
To obtain accessories for your unit, please
contact your Garmin dealer.
The display surface is coated with a special
anti-reflective coating which is very sensitive to
skin oils, waxes and abrasive cleaners. It is very
important to clean the lens using an eyeglass
lens cleaner which is specified as safe for
anti-reflective coatings and a clean, lint-free cloth.
AC 90-100A Statement of Compliance.
The Garmin navigational unit meets the
performance and functional requirements
of FAA Advisory Circular (AC) 90-100A, U.S.
Terminal and En Route Area Navigation (RNAV)
Operations .

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Appendix
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Product Registration and Support
Help us better support you by completing your online registration today!
Have the serial number of your product handy and visit flyGarmin.com.
Record of Revisions
Part Number Revision Date Description
190-01004-03 A
B
C
D
E
F
G
H
J
K
L
M
N
P
02/04/11
03/16/11
11/29/12
02/28/13
03/25/13
08/26/13
08/01/14
10/17/14
07/2015
01/2016
09/2016
08/2017
08/2018
04/2019
Initial release.
Update information.
Updates for software v3.0.
Updates for software v4.0.
Updates for software v4.10.
Updates for software v5.0.
Updates for software v5.10.
Updates for software v5.12.
Updates for software v6.00.
Updates for software v6.10.
Updates for software v6.20.
Updates for software v6.30.
Updates for software v6.50.
Updates for software v6.60.

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Table of Contents
Software License Agreement.............................................................................. i
Product Registration and Support ................................................................... viii
Welcome ...................................................................................................... xxv
About This Guide........................................................................................... xxv
Electronic Document Features........................................................................ xxv
Conventions..................................................................................................xxvi
1 Getting Started....................................................................................1-1
1.1 Model Descriptions .............................................................................. 1-1
1.1.1 GTN 625............................................................................... 1-1
1.1.2 GTN 635............................................................................... 1-2
1.1.3 GTN 650............................................................................... 1-2
1.2 About This Pilot's Guide....................................................................... 1-2
1.2.1 Conventions.......................................................................... 1-2
1.2.2 Using the Touchscreen........................................................... 1-2
1.3 Product Description.............................................................................. 1-3
1.3.1 Datacard...............................................................................1-3
1.3.2 Pilot Controls ........................................................................ 1-4
1.4 Unit Power Up .....................................................................................1-6
1.4.1 Start-Up Screens.................................................................... 1-6
1.4.2 Database Verification and Fuel Settings..................................1-7
1.5 System Operation............................................................................... 1-10
1.5.1 Using the Touchscreen Key Controls.....................................1-10
1.5.2 Setup Page.......................................................................... 1-10
1.5.3 Dual GTN Installations......................................................... 1-13
1.6 Direct-To Navigation..........................................................................1-14
1.6.1 Direct-To a Waypoint ...........................................................1-14
1.6.2 Direct-To a Flight Plan Waypoint .......................................... 1-14
1.6.3 Direct-To a Nearest Airport ..................................................1-14
1.7 Selecting Com/Nav Frequencies.......................................................... 1-15
1.8 Flight Planning .................................................................................. 1-17
1.8.1 Creating a Flight Plan.......................................................... 1-17
1.9 VFR and IFR Procedures ..................................................................... 1-18
1.10 Dead Reckoning................................................................................. 1-19
1.11 Default Navigation.............................................................................1-20
1.11.1 Configuring User Fields........................................................ 1-20
1.11.2 CDI (GTN 650 only) .............................................................1-23

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1.11.3 OBS Function ...................................................................... 1-23
1.12 FastFind Predictive Waypoint Entry ..................................................... 1-23
1.12.1 FastFind With
Waypoint Info .........................................................1-23
1.12.2 FastFind With A Flight Plan ..................................................1-24
2 Audio and Transponder Controls
(Optional).............................................................................................2-1
2.1 Transponder Operation......................................................................... 2-1
2.1.1 Select Transponder.................................................................2-2
2.1.2 IDENT ...................................................................................2-3
2.1.3 Transponder Mode................................................................. 2-3
2.1.4 VFR.......................................................................................2-5
2.1.5 Selecting a Squawk Code ...................................................... 2-6
2.1.6 GDL 88 ADS-B Reporting ....................................................... 2-7
2.1.7 Extended Squitter Transmission ..............................................2-9
2.1.8 TCAS II Transponder Mode Controls ....................................... 2-9
2.2 Marker Beacon Annunciations............................................................2-10
2.3 TelligenceTM Voice Command..............................................................2-11
3 NAV/COM .............................................................................................3-1
3.1 Volume................................................................................................3-2
3.2 Squelch ...............................................................................................3-2
3.3 Com and Nav Frequency Window and Tuning ....................................... 3-3
3.3.1 Com and Nav Frequency Finding............................................ 3-5
3.3.2 Simple Frequency Entry..........................................................3-8
3.3.3 Adding a New User Frequency ...............................................3-9
3.3.4 Emergency Frequency ..........................................................3-11
3.3.5 Stuck Microphone ............................................................... 3-12
3.3.6 Remote Frequency Selection Control ....................................3-12
3.3.7 Reverse Frequency Look-Up .................................................3-12
3.4 Com Frequency Monitoring ................................................................ 3-13
3.5 Nav (VOR/Localizer/Glideslope) Receiver
Operations.........................................................................................3-14
3.5.1 Ident Audio and Volume ......................................................3-14
3.5.2 Nav Tuning Window............................................................. 3-15
3.5.3 Nav Frequency Finding ........................................................3-16
4 Flight Plans ..........................................................................................4-1
4.1 Creating a New Flight Plan .................................................................. 4-2
4.2 Active Flight Plan Page.........................................................................4-4

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4.2.1 Waypoint Options..................................................................4-4
4.2.2 Airways............................................................................... 4-11
4.2.3 Load Hold at Waypoint ........................................................4-14
4.2.4 Load Search and Rescue Pattern (Optional) .......................... 4-16
4.3 Flight Plan Menu ...............................................................................4-23
4.3.1 Store Flight Plan.................................................................. 4-24
4.3.2 Invert Flight Plan ................................................................. 4-24
4.3.3 En Route Vertical Navigation................................................4-25
4.3.4 Temperature Compensated Altitude ..................................... 4-32
4.3.5 Parallel Track .......................................................................4-33
4.3.6 Edit Data Fields ................................................................... 4-35
4.3.7 Flight Plan Catalog Route Options ....................................... 4-36
4.3.8 Delete Flight Plan ................................................................4-41
4.3.9 Preview Flight Plan..............................................................4-43
4.4 Graphically Editing a Flight Plan......................................................... 4-44
4.5 Import Flight Plans with Connext .......................................................4-44
4.5.1 Operation............................................................................ 4-44
4.5.2 Potential Errors....................................................................4-46
4.6 Import Flight Plans with a Datacard....................................................4-48
4.6.1 Potential Errors....................................................................4-50
5 Direct-To...............................................................................................5-1
5.1 Direct-To Navigation............................................................................5-1
5.2 Direct-To a Flight Plan Waypoint...........................................................5-3
5.3 Direct-To a Nearest Airport................................................................... 5-4
5.4 Removing a Direct-To Course ............................................................... 5-5
5.5 Direct-To Map Waypoint....................................................................... 5-6
5.6 Off-Route Direct-To Course ..................................................................5-7
5.7 Graphically Editing a Direct-To Route.................................................... 5-7
5.8 Direct-To a User-Defined Hold..............................................................5-8
5.9 Direct-To a Search and Rescue Pattern..................................................5-9
6 Procedures ...........................................................................................6-1
6.1 Basic Approach Operations ..................................................................6-2
6.2 Selecting a Departure........................................................................... 6-3
6.3 Selecting an Arrival ..............................................................................6-6
6.4 Selecting an Approach ......................................................................... 6-9
6.5 Approaches with Procedure Turns.......................................................6-13
6.6 Flying the Missed Approach ............................................................... 6-13

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6.7 Flying an Approach with a Hold..........................................................6-14
6.8 Flying a DME Arc Approach................................................................6-15
6.9 Radius-to-Fix (RF) Approaches............................................................ 6-16
6.10 Vectors to Final.................................................................................. 6-16
6.11 ILS Approaches (GTN 650 Only) .........................................................6-17
6.12 RNAV Approach Procedures ............................................................... 6-18
6.12.1 Flying the LPV Approach......................................................6-19
6.12.2 Flying the LP Approach ........................................................6-20
6.13 Visual Approach Procedures ............................................................... 6-22
6.14 Points to Remember for All Procedures ...............................................6-24
6.15 Points to Remember for Localizer or
VOR-based Approaches...................................................................... 6-25
6.16 Enabling Autopilot Outputs for the
King KAP140/KFC225........................................................................6-26
7 Waypoint Info ......................................................................................7-1
7.1 Waypoint Selection .............................................................................. 7-3
7.2 Airport................................................................................................. 7-4
7.2.1 Info....................................................................................... 7-4
7.2.2 Preview.................................................................................7-5
7.2.3 Procedures ............................................................................7-6
7.2.4 Runways ...............................................................................7-7
7.2.5 Frequencies...........................................................................7-8
7.2.6 Weather (WX) Data...............................................................7-9
7.2.7 NOTAM Pages .......................................................................7-9
7.2.8 Helipads..............................................................................7-10
7.2.9 Nearest VRPs....................................................................... 7-10
7.3 Intersection (INT) ............................................................................... 7-11
7.4 VOR ..................................................................................................7-12
7.5 VRP...................................................................................................7-13
7.6 NDB ..................................................................................................7-14
7.7 User Waypoints.................................................................................. 7-15
7.7.1 Select User Waypoint by Name.............................................7-15
7.7.2 Select User Waypoint from a List.......................................... 7-16
7.7.3 Edit User Waypoint.............................................................. 7-16
7.7.4 Delete User Waypoint ..........................................................7-16
7.7.5 Delete All User Waypoints....................................................7-17
7.8 Create Waypoint ................................................................................7-18

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7.8.1 Mark On Target ................................................................... 7-19
7.8.2 Waypoint Location Based on LAT/LON ................................7-20
7.8.3
Waypoint Location Based on Two Radials ........................................7-21
7.8.4 Waypoint Location Based on Radial and Distance............................7-22
7.9 Import User Waypoints (Datacard)...................................................... 7-23
8 Map......................................................................................................8-1
8.1 Map Menu .......................................................................................... 8-3
8.1.1 Map Overlays ........................................................................ 8-4
8.1.2 Map Setup ............................................................................ 8-9
8.1.3 Change User Fields..............................................................8-29
8.1.4 Map Detail..........................................................................8-32
8.2 Map Panning.....................................................................................8-34
8.3 Map Controls.....................................................................................8-36
8.3.1 Pan Map Mode....................................................................8-36
8.3.2 Create Waypoint..................................................................8-36
8.3.3 Graphically Edit Flight Plan Mode ........................................8-37
8.4 CDI (GTN 650 only) ...........................................................................8-41
8.5 OBS...................................................................................................8-41
8.6 Map Symbols.....................................................................................8-43
8.7 SafeTaxi®.........................................................................................8-44
8.7.1 Using SafeTaxi®..................................................................8-44
8.7.2 Hot Spot Information...........................................................8-45
8.7.3 SafeTaxi®Cycle Number and Revision ..................................8-45
8.8 Flight Plan Depiction..........................................................................8-46
9 Traffic ...................................................................................................9-1
9.1 Traffic Pop-Up......................................................................................9-1
9.2 Traffic Test ........................................................................................... 9-2
9.3 TIS (Optional) ...................................................................................... 9-3
9.3.1 TIS Symbology....................................................................... 9-4
9.3.2 Traffic Page ...........................................................................9-5
9.3.3 Displaying Traffic on the Traffic Page.......................................9-6
9.3.4 Altitude Display..................................................................... 9-6
9.3.5 TIS Limitations.......................................................................9-7
9.3.6 TIS Alerts...............................................................................9-9
9.3.7 TIS System Status ................................................................ 9-10
9.4 TAS (Optional) ................................................................................... 9-12
9.4.1 TAS Symbology....................................................................9-13

xiv
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
9.4.2 Displaying and Operating Traffic
(TAS Systems) ...................................................................................... 9-14
9.4.3 Altitude Display................................................................... 9-15
9.4.4 Traffic System Status............................................................9-16
9.5 ADS-B Traffic......................................................................................9-17
9.5.1 Traffic Applications - SURF, AIRB, etc.....................................9-19
9.5.2 ADS-B Traffic Menu.............................................................. 9-19
9.5.3 Rotorcraft Traffic Page Orientation........................................9-23
9.6 RYAN TCAD 9900BX with the GDL 88 ................................................9-24
9.6.1 Ryan TCAD Description........................................................9-24
9.6.2 Altitude Mode.....................................................................9-25
9.6.3 TCAD Control Menu ............................................................ 9-26
9.7 TCAD 9900B Operation ..................................................................... 9-29
9.7.1 Select Local Barometric Pressure..........................................9-30
9.7.2 Select Active Shield..............................................................9-30
9.7.3 TCAD 9900B Traffic Menu....................................................9-30
9.8 TCAD 9900BX Operation ................................................................... 9-33
9.8.1 Select Local Barometric Pressure..........................................9-33
9.8.2 Select Altitude Filter.............................................................9-34
9.8.3 TCAD 9900BX Traffic Menu .................................................9-34
9.9 TCAS II .............................................................................................. 9-37
9.9.1 TCAS II Theory of Operation.................................................9-37
9.9.2 TCAS II with ADS-B..............................................................9-39
9.9.3 TCAS II Alerts ...................................................................... 9-40
9.9.4 TCAS II System Test ............................................................. 9-44
9.9.5 TCAS II Operation................................................................9-45
10 Terrain................................................................................................10-1
10.1 Terrain Configurations........................................................................10-1
10.2 GPS Altitude for Terrain...................................................................... 10-2
10.2.1 GSL Altitude & Indicated Altitude.........................................10-2
10.3 General Database Information............................................................10-3
10.3.1 Database Versions ...............................................................10-3
10.3.2 HTAWS Database Requirements...........................................10-3
10.3.3 Database Updates...............................................................10-3
10.3.4 Terrain Database Areas of Coverage.....................................10-4
10.3.5 Obstacle Database Areas of Coverage..................................10-5
10.4 Terrain Proximity................................................................................10-6

xv190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
10.4.1 Displaying Terrain Proximity ................................................. 10-7
10.4.2 Terrain Limitations............................................................... 10-9
10.5 Terrain Alerting ............................................................................... 10-10
10.5.1 Terrain Alerting Requirements ............................................10-10
10.5.2 Terrain Alerting Limitations ................................................10-10
10.5.3 Using Terrain Alerting ........................................................ 10-11
10.5.4 Displaying Terrain Alerting Data ......................................... 10-11
10.5.5 Terrain Page ......................................................................10-13
10.5.6 Terrain Alerts.....................................................................10-15
10.5.7 Terrain System Status......................................................... 10-20
10.6 TAWS-B (Optional)........................................................................... 10-21
10.6.1 TAWS-B Requirements.......................................................10-21
10.6.2 TAWS-B Limitations...........................................................10-21
10.6.3 Using TAWS-B ...................................................................10-22
10.6.4 Displaying TAWS-B Data .................................................... 10-22
10.6.5 TAWS-B Page ....................................................................10-24
10.6.6 TAWS-B Alerts...................................................................10-26
10.6.7 TAWS-B System Status....................................................... 10-33
10.7 HTAWS (Optional)............................................................................ 10-34
10.7.1 HTAWS Requirements........................................................10-34
10.7.2 HTAWS Limitations............................................................10-35
10.7.3 Power Up..........................................................................10-35
10.7.4 HTAWS Page .....................................................................10-36
10.7.5 HTAWS Symbols ................................................................ 10-42
10.7.6 HTAWS Alerts....................................................................10-44
10.7.7 Pilot Actions......................................................................10-50
10.8 TAWS-A (Optional)...........................................................................10-51
10.8.1 TAWS-A Requirements....................................................... 10-51
10.8.2 TAWS-A Limitations........................................................... 10-51
10.8.3 Displaying TAWS-A Data.................................................... 10-52
10.8.4 TAWS-A Page.................................................................... 10-53
10.8.5 TAWS-A Alerts................................................................... 10-56
10.8.6 Altitude Voice Call Out (VCO) ............................................10-71
10.8.7 TAWS-A System Status ......................................................10-72
10.8.8 TAWS-A Abnormal Operations ........................................... 10-72
11 Weather .............................................................................................11-1
11.1 SiriusXM Weather Products (Optional) ..................................................................... 11-2

xvi
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
11.1.1 Displaying SiriusXM Weather ...............................................11-3
11.1.2 Weather Legend..................................................................11-4
11.1.3 Weather Map Orientation....................................................11-5
11.1.4 SiriusXM Product Age .......................................................... 11-6
11.1.5 NEXRAD .............................................................................11-7
11.1.6 Echo Tops..........................................................................11-12
11.1.7 Cloud Tops ........................................................................11-13
11.1.8 Cell Movement..................................................................11-14
11.1.9 SIGMETs and AIRMETs ...................................................... 11-15
11.1.10 County Warnings............................................................... 11-16
11.1.11 Freezing Level....................................................................11-17
11.1.12 METARs ............................................................................11-18
11.1.13 Cyclone.............................................................................11-19
11.1.14 Lightning...........................................................................11-20
11.1.15 City Forecast .....................................................................11-21
11.1.16 Surface Analysis.................................................................11-22
11.1.17 Winds Aloft ....................................................................... 11-23
11.1.18 Icing .................................................................................11-24
11.1.19 Turbulence ........................................................................11-25
11.1.20 AIREP/PIREP...................................................................... 11-26
11.2 Stormscope®Weather...................................................................... 11-27
11.2.1 Stormscope (Optional).......................................................11-27
11.2.2 Clearing the Stormscope Page ...........................................11-29
11.2.3 Changing the Stormscope Display View..............................11-29
11.2.4 Changing the Stormscope Data Mode................................ 11-30
11.2.5 Changing the Stormscope Data Display Range ...................11-30
11.2.6 Displaying Stormscope Data on the Map Page....................11-30
11.3 Connext Weather.............................................................................11-31
11.3.1 Using Connext Satellite Weather Products..........................11-32
11.3.2 Connext Weather Menu..................................................... 11-33
11.3.3 Connext Settings...............................................................11-34
11.3.4 Register with Connext ....................................................... 11-36
11.3.5 Connext Weather Product Age ........................................... 11-38
11.3.6 TFRs..................................................................................11-38
11.3.7 Precipitation (PRECIP) Data ...............................................11-39
11.3.8 Lightning...........................................................................11-40
11.3.9 Infrared Satellite Data........................................................11-41
11.3.10 METARs ............................................................................11-41

xvii190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
11.3.11 PIREPs ..............................................................................11-43
11.3.12 Winds Aloft ....................................................................... 11-44
11.3.13 SIGMETs and AIRMETs ...................................................... 11-45
11.4 FIS-B Weather..................................................................................11-46
11.4.1 FIS-B Operation................................................................. 11-49
11.4.2 FIS-B NEXRAD................................................................... 11-50
11.4.3 FIS-B TFRs ......................................................................... 11-55
11.4.4 Cloud Tops ........................................................................11-56
11.4.5 Lightning...........................................................................11-56
11.4.6 FIS-B METARs....................................................................11-57
11.4.7 FIS-B SIGMETs and Textual AIRMETs ..................................11-58
11.4.8 Graphical AIRMETs............................................................ 11-59
11.4.9 Center Weather Advisory ................................................... 11-61
11.4.10 FIS-B Winds and Temperatures Aloft................................... 11-62
11.4.11 Icing .................................................................................11-63
11.4.12 Turbulence ........................................................................11-64
11.4.13 FIS-B PIREPs...................................................................... 11-65
12 Nearest ..............................................................................................12-1
12.1 Select a Nearest Page ........................................................................12-2
12.2 Nearest Airport .................................................................................. 12-3
12.3 Nearest Intersection (INT) ..................................................................12-4
12.4 Nearest VOR...................................................................................... 12-5
12.5 Nearest VRP ......................................................................................12-6
12.6 Nearest NDB......................................................................................12-7
12.7 Nearest User Waypoint.......................................................................12-8
12.8 Nearest Airspace................................................................................ 12-9
12.9 Nearest ARTCC ................................................................................ 12-11
12.10Nearest Flight Service Station (FSS) .................................................. 12-12
12.11Nearest Weather Frequency (WX Freq)..............................................12-13
13 Services/Music ...................................................................................13-1
13.1 Music ................................................................................................13-2
13.2 Activating SiriusXM Satellite Radio Services........................................ 13-3
13.3 Music Operation ................................................................................13-4
13.3.1 Browsing Channels and Categories......................................13-5
13.3.2 Selecting a SiriusXM Satellite Radio Channel by Number ......13-6
13.3.3 SiriusXM Satellite Radio Volume...........................................13-7
13.3.4 SiriusXM Satellite Radio Channel Presets .............................13-8

xviii
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
13.4 GDL 69/69A Data Link Receiver
Troubleshooting.................................................................................13-9
13.5 Iridium Phone Operation (Optional)..................................................13-11
13.5.1 Status ...............................................................................13-11
13.5.2 Making a Phone Call ......................................................... 13-12
13.5.3 Answering a Phone Call ....................................................13-13
13.5.4 Suppress Visuals................................................................ 13-14
13.5.5 Phone Volume ...................................................................13-15
13.5.6 SMS Text Operation ...........................................................13-15
13.5.7 Position Reporting.............................................................13-18
13.5.8 Contacts ...........................................................................13-20
14 Utilities ..............................................................................................14-1
14.1 Vertical Calculator (VCALC)................................................................ 14-4
14.1.1 Target Altitude..................................................................... 14-6
14.1.2 Altitude Type .......................................................................14-6
14.1.3 Vertical Speed (VS) Profile.................................................... 14-7
14.1.4 Target Offset ....................................................................... 14-7
14.1.5 Before/After Target Waypoint ............................................... 14-8
14.1.6 Target Waypoint ..................................................................14-8
14.1.7 Display VCALC Messages..................................................... 14-9
14.1.8 Restore VCALC Defaults....................................................... 14-9
14.2 Flight Timers ....................................................................................14-10
14.3 RAIM Prediction............................................................................... 14-11
14.4 Trip Planning ................................................................................... 14-13
14.4.1 Point-To-Point Mode.......................................................... 14-14
14.4.2 Flight Plan Mode...............................................................14-17
14.5 Fuel Planning................................................................................... 14-19
14.5.1 Point-To-Point Mode.......................................................... 14-19
14.5.2 Flight Plan Mode...............................................................14-22
14.6 DALT/TAS/Winds .............................................................................. 14-24
14.7 Clean Screen Mode.......................................................................... 14-27
14.8 Scheduled Messages........................................................................14-28
14.9 Checklists........................................................................................14-29
14.9.1 Checklists Menu................................................................ 14-29
14.9.2 Viewing Checklists............................................................. 14-30
15 System ...............................................................................................15-1
15.1 System Status .................................................................................... 15-3