Garmin Cessna Caravan G1000 Manual

G1000
TM
Pilot’s Guide for Cessna Nav III

Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. A
Part Number Change Summary
190-00498-00
(Rev. A)
Initial release.
Record of Revisions
Revision Date of Revision Revision Page Range Description
A 11/05 i through I-8 Initial release.

Garmin G1000 Pilot’s Guide for Cessna Nav III
190-00498-00 Rev. A i
COPYRIGHT
Copyright © 2005 Garmin Ltd. or its subsidiaries. All rights reserved.
This manual reflects the operation of System Software versions 0394.06 or later for Cessna 172R aircraft, 0395.07 or later for Cessna
172S aircraft, 0371.15 or later for normally aspirated Cessna 182 aircraft, 0372.14 or later for turbocharged Cessna 182 aircraft,
0373.10 or later for normally aspirated Cessna 206 aircraft, and 0374.10 or later for turbocharged Cessna 206 aircraft. Some differ-
ences in operation may be observed when comparing the information in this manual to earlier or later software versions.
NOTE: Cessna Nav III aircraft include the Cessna 172R, the Cessna 172S, the normally aspirated Cessna 182
(182), the turbocharged Cessna 182 (T182), the normally aspirated Cessna 206 (206), and the turbocharged
Cessna 206 (T206). Unless otherwise indicated, information in the G1000 Pilot’s Guide binder pertains to all
Cessna Nav III aircraft.
Garmin International, Inc., 1200 East 151st Street, Olathe, Kansas 66062, U.S.A.
Tel: [phone] Fax: [phone]
Garmin AT, Inc., 2345 Turner Road SE, Salem, OR 97302, U.S.A.
Tel: [phone] Fax [phone]
Garmin (Europe) Ltd., Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, Hampshire S051 9DL, U.K.
Tel: [phone] Fax: [phone]
Garmin Corporation, No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
Tel: [phone] Fax: [phone]
Web Site Address: www.garmin.com
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.
Garmin® is a registered trademark of Garmin Ltd. or its subsidiaries, and G1000™ is a trademark of Garmin Ltd. or its subsidiaries.
These trademarks may not be used without the express permission of Garmin.
Bendix/King® and Honeywell® are registered trademarks of Honeywell International, Inc., Silver Crown Plus™ is a trademark of
Honeywell International, Inc.; NavData® is a registered trademark of Jeppesen, Inc.; Stormscope® and Skywatch® are registered
trademarks of L-3 Communications; TCAD® is a registered trademark of Ryan International, Inc.; and XM® is a registered trademark
of XM Satellite Radio, Inc.
November 2005 190-00498-00 Rev. A Printed in the U.S.A.

Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. Aii
WARNINGS & CAUTIONS
WARNING: Navigation and terrain separation must NOT be predicated upon the use of the terrain
function. The G1000 Terrain 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. The Terrain Proximity feature 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 Garmin G1000, as installed in Cessna Nav III aircraft, 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 G1000. 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: For safety reasons, G1000 operational procedures must be learned on the ground.
WARNING: The altitude calculated by G1000 GPS receivers is geometric height above Mean Sea Level
and could vary significantly from the altitude displayed by pressure altimeters, such as the GDC 74A
Air Data Computer, or other altimeters in aircraft. GPS altitude should never be used for vertical
navigation. Always use pressure altitude displayed by the G1000 PFD or other pressure altimeters in
aircraft.
WARNING: The Jeppesen database used in the G1000 system must be updated regularly in order to
ensure that its information remains current. Updates are released every 28 days. A database information
packet is included in the G1000 package. Pilots using an outdated database do so entirely at their own
risk.

Garmin G1000 Pilot’s Guide for Cessna Nav III
190-00498-00 Rev. A iii
WARNINGS & CAUTIONS
WARNING: The basemap (land and water data) must not be used for navigation, but rather only for non-
navigational situational awareness. Any basemap indication should be compared with other navigation
sources.
CAUTION: The illustrations in this guide are only examples. Never use the G1000 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 radar echo.”
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 Garmin G1000 utilize GPS as a precision
electronic NAVigation AID (NAVAID). Therefore, as with all NAVAIDs, information presented by the
G1000 can be misused or misinterpreted and, therefore, become unsafe.
CAUTION: To reduce the risk of unsafe operation, carefully review and understand all aspects of the
G1000 Pilot’s Guide documentation. Thoroughly practice basic operation prior to actual use. During
flight operations, carefully compare indications from the G1000 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.
CAUTION: The Garmin G1000 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 GDU 1040 PFD and MFD displays use a lens coated with 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.

Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. Aiv
WARNINGS & CAUTIONS
NOTE: All visual depictions contained within this document, including screen images of the G1000 panel
and displays, are subject to change and may not reflect the most current G1000 system. 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: There are several atmospheric phenomena in addition to nearby thunderstorms that can cause
isolated discharge points in the strike display mode. However, clusters of two or more discharge points
in the strike display mode do indicate thunderstorm activity if these points reappear after the screen
has been cleared. Avoid the clusters to avoid the thunderstorms. In the cell display mode, even a single
discharge point may represent thunderstorm activity and should therefore be avoided.

Garmin G1000 Pilot’s Guide for Cessna Nav III
190-00498-00 Rev. A v
WARRANTY
LIMITED WARRANTY
This Garmin product is warranted to be free from defects in materials or workmanship for two years from the date of purchase. Within this
period, Garmin will, at its sole option, repair or replace any components that fail in normal use. Such repairs or replacement will be made at no
charge to the customer for parts and labor, provided that the customer shall be responsible for any transportation cost. This warranty does not
cover failures due to abuse, misuse, accident, or unauthorized alterations or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR
STATUTORY, INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING
FROM THE USE, MISUSE, OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of
incidental or consequential damages, so the above limitations may not apply to you.
Garmin retains the exclusive right to repair or replace the unit or software, or to offer a full refund of the purchase price, at its sole discretion.
SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local Garmin Authorized Service Center. For assistance in locating a Service Center near you, visit the
Garmin Web site at “http://www.garmin.com” or contact Garmin Customer Service at 800-800-1020.

Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. Avi
WARRANTY
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Garmin G1000 Pilot’s Guide for Cessna Nav III
190-00498-00 Rev. A vii
TABLE OF CONTENTS
SECTION 1 SYSTEM OVERVIEW
1.1 System Description ......................................... 1-1
1.2 Line Replaceable Units ................................... 1-1
1.3 PFD/MFD Controls .......................................... 1-7
1.4 Secure Digital Cards ....................................... 1-9
1.5 System Power-up ...........................................1-10
1.6 Display Backlighting ......................................1-12
1.7 System Operation ..........................................1-12
Normal Mode ...........................................................1-12
Reversionary Mode ..................................................1-13
AHRS Operation .......................................................1-14
SECTION 2 PRIMARY FLIGHT DISPLAY
2.1 Introduction .................................................... 2-1
2.2 Backlighting ................................................... 2-4
2.3 Softkey Function ............................................ 2-5
2.4 Flight Instruments .......................................... 2-9
Airspeed Indicator ......................................................2-9
Attitude Indicator .....................................................2-10
Altimeter ..................................................................2-12
Vertical Speed Indicator ...........................................2-14
Horizontal Situation Indicator ..................................2-15
2.5 Communication, Navigation & Surveillance ..2-21
Communication Frequency Window .........................2-21
Navigation Frequency Window .................................2-21
Navigation Status Bar ..............................................2-22
Transponder Status Bar ............................................2-23
2.6 Supplemental Flight Data ..............................2-24
Outside Air Temperature Box ....................................2-24
System Time Box ......................................................2-24
Traffic Annunciation .................................................2-24
Terrain Proximity ......................................................2-25
Terrain Awareness and Warning System (TAWS)
(Optional) .................................................................2-26
Inset Map .................................................................2-27
Working with Menus ................................................2-29
Auxiliary Window Keys .............................................2-30
Auxiliary Windows ....................................................2-31
2.7 Reversionary Mode .......................................2-45
2.8 Alerts and Annunciations ...............................2-46
Alerts Window ..........................................................2-46
Annunciation Window ..............................................2-46
Softkey Annunciations ..............................................2-46
SECTION 3 NAV/COM
3.1 Overview ........................................................ 3-1
Windows and Fields ...................................................3-2
Radio Selection ...........................................................3-2
Controls ......................................................................3-3
Tuning Box .................................................................3-4
Switching Between Radios .........................................3-4
Manually Tuning a Frequency .....................................3-4
Radio Indicators .........................................................3-5
Volume .......................................................................3-5
Frequency Transfer Arrow ...........................................3-5
3.2 COM Operation ............................................... 3-6
Frequency Spacing ......................................................3-6
Automatic Squelch .....................................................3-6
Selecting a COM Radio ...............................................3-6
Emergency Frequency (121.500 MHz) ........................3-7
Quick-Tuning and Activating 121.500 MHz ................3-7
Stuck Microphone ......................................................3-7
3.3 NAV Operation ................................................ 3-8
Frequency Range ........................................................3-8
Morse Code Identifier .................................................3-8
NAV Radio Selection for Navigation ...........................3-8
ADF/DME Tuning ........................................................3-9
DME Tuning ................................................................3-9
3.4 Frequency Auto-tuning ..................................3-10
Auto-tuning on the PFD ...........................................3-10

Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. Aviii
TABLE OF CONTENTS
Auto-tuning on the MFD ..........................................3-11
Auto-Tuning on Approach Activation
(NAV Frequencies) ....................................................3-17
SECTION 4 TRANSPONDER
4.1 Transponder Description ................................. 4-1
Transponder Softkeys .................................................4-1
Transponder Status Bar ..............................................4-1
Mode S Features .........................................................4-2
Traffic Information Service (TIS) ..................................4-2
4.2 Operation ....................................................... 4-3
Mode Selection ..........................................................4-3
Code Selection ...........................................................4-4
IDENT Function ..........................................................4-5
SECTION 5 AUDIO PANEL
5.1 Audio Panel Description ................................. 5-1
Transceivers ................................................................5-1
Mono/Stereo Headsets ...............................................5-2
Unmuted/Unswitched Inputs ......................................5-2
Front Panel Controls ...................................................5-2
5.2 Operation ....................................................... 5-4
Power-up and Fail-safe Operation ..............................5-4
Key Annunciators ........................................................5-4
Lighting ......................................................................5-4
Transceiver Keys .........................................................5-4
Optional COM Muting ................................................5-5
Split COM Function ....................................................5-5
PA Function ................................................................5-5
Speaker ......................................................................5-6
Marker Beacon Receiver .............................................5-6
Marker Beacon Volume Adjustment ...........................5-6
Navigation Radios ......................................................5-7
Intercom System (ICS) Isolation ..................................5-8
Intercom Volume and Squelch ....................................5-9
Entertainment Inputs ..................................................5-9
GDL 69/69A XM Radio System .................................5-10
Master Avionics Squelch (MASQ) .............................5-10
Digital Clearance Recorder with Playback Capability 5-11
Reversionary Mode ..................................................5-11
SECTION 6 ENGINE INDICATION SYSTEM
6.1 Introduction .................................................... 6-1
EIS Pages ....................................................................6-1
EIS Indicators ..............................................................6-1
EiS Page Reversion .....................................................6-2
6.2 Engine Page .................................................... 6-3
6.3 Lean Page ....................................................... 6-6
6.4 System Page ................................................... 6-9
SECTION 7 MULTI FUNCTION DISPLAY
7.1 Introduction .................................................... 7-1
Description .................................................................7-1
Reversionary Mode ....................................................7-1
Optional Equipment ...................................................7-1
MFD Power-up ............................................................7-2
MFD Backlighting .......................................................7-2
MFD Softkeys ............................................................7-2
Electronic Checklists (optional) ..................................7-4
MFD Page Groups ......................................................7-7
Working With Menus ..................................................7-8
7.2 Navigation Map Page ..................................... 7-9
Navigation Map Page Operations ............................7-11
7.3 Traffic Map Page ............................................7-33
TIS Symbology ..........................................................7-34
Traffic Map Page Operations ....................................7-34
7.4 Terrain Proximity Page ..................................7-37
Terrain Proximity Page Operations ...........................7-38
Displaying Obstacle Data .........................................7-39
Navigation Map Display Conditions .........................7-39

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TABLE OF CONTENTS
7.5 Terrain Awareness & Warning System
(TAWs) Display (Optional) ............................7-40
Displaying Terrain on the TAWS Page .......................7-40
7.6 Direct-to Navigation ......................................7-49
Direct-to Navigation Operations ...............................7-50
7.7 Flight Plans ....................................................7-54
Active Flight Plan Page .............................................7-54
Active Flight Plan Page Options ...............................7-54
Flight Plan Catalog Page ..........................................7-64
Flight Plan Catalog Page Operations .......................7-64
Vertical Navigation (VNAV) Page ..............................7-70
7.8 Procedures .....................................................7-72
Arrivals and Departures ............................................7-72
Approaches ..............................................................7-73
G1000 Navigational Guidance for Approaches ........7-73
Selecting Approaches ...............................................7-74
7.9 Waypoint Page Group ....................................7-77
AIRPORT Information Page (INFO) ............................7-78
Airport Frequency Information Field .........................7-81
AIRPORT Information Page Options .........................7-82
Departure Information Page (DP) .............................7-83
Arrival Information Page (STAR) ...............................7-84
Approach Information Page ......................................7-86
Intersection Information Page ..................................7-88
NDB Information Page ..............................................7-90
VOR Information Page ..............................................7-93
User Waypoint Information Page ..............................7-96
Creating User Waypoints ..........................................7-98
Modifying User Waypoints .....................................7-100
User Waypoint Information Page Options ...............7-101
7.10 Auxiliary Page Group .................................7-105
Trip Planning Page ..................................................7-105
GPS Status Page .....................................................7-112
System Setup Page .................................................7-116
System Status Page ................................................7-124
7.11 Nearest Page Group ..................................7-125
Navigating to a Nearest Waypoint .........................7-126
Nearest Intersections Page .....................................7-130
Nearest NDB Page ..................................................7-131
Nearest VOR Page ..................................................7-132
Nearest User Waypoint Page ..................................7-134
Nearest Frequencies Page .......................................7-135
Nearest Airspaces Page ..........................................7-137
SECTION 8 OPTIONAL EQUIPMENT
8.1 Introduction .................................................... 8-1
8.2 WX-500 Stormscope ....................................... 8-1
Displaying Stormscope Lightning Data on the
Navigation Map Page .................................................8-1
Stormscope Page ........................................................8-5
8.3 Traffic Advisory System .................................. 8-7
Displaying and Configuring TAS Traffic on the
Navigation Map Page .................................................8-7
Traffic Map Page .........................................................8-8
Failure Response ........................................................8-9
Description of Traffic Advisory Criteria ........................8-9
User-Initiated Test .......................................................8-9
TAS Voice Announcements .......................................8-10
Switching Between Standby and Various
Operating Modes .....................................................8-10
Altitude Display Mode ..............................................8-10
Traffic Map Page Display Range ...............................8-10
8.4 XM Weather and XM Radio ...........................8-11
Introduction ..............................................................8-11
XM Weather ............................................................8-11
Weather Product Symbols ........................................8-21
XM Digital Audio Entertainment ..............................8-23
XM Radio Page .........................................................8-24
SECTION 9 ANNUNCIATIONS & ALERTS
9.1 Introduction .................................................... 9-1

Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. Ax
TABLE OF CONTENTS
9.2 Alert Level Definitions .................................... 9-2
9.3 Cessna Nav III Aircraft Alerts .......................... 9-3
9.4 CO Guardian Messages .................................. 9-3
9.5 TAWS ALERTS .................................................. 9-4
9.6 G1000 System Annunciations ......................... 9-6
9.7 G1000 System Message Advisories ................ 9-9
APPENDICES
Appendix A SD Card Use ......................................A-1
Aviation Database ..................................................... A-1
Terrain and Obstacle Databases ................................ A-1
Appendix B Abbreviations, Acronyms & NAV
Terms ............................................................ B-1
Appendix C Questions & Answers ........................ C-1
Appendix D G1000 Map Datums ..........................D-1
Appendix E General TIS Information .................... E-1
Introduction ................................................................E-1
TIS vs. TCAS ................................................................E-1
TIS Limitations ............................................................E-1
Appendix F Map Symbols ..................................... F-1
Airport ........................................................................F-1
NAVAIDS .................................................................... F-1
Basemap .................................................................... F-1
Traffic .........................................................................F-2
Lightning Strike ..........................................................F-2
Impact Points (TAWS Only) .........................................F-2
Miscellaneous ............................................................F-2
Line Symbols .............................................................. F-3
Obstacle database ..................................................... F-4
Terrain Color Chart .....................................................F-4
Appendix G G1000 System Specifications ...........G-1
GDU 1040 MFD & PFD .............................................. G-1
GMA 1347 Audio Panel ............................................. G-1
GIA 63 Integrated Avionics Units .............................. G-1
GDC 74A Air Data Computer ..................................... G-2
GTX 33 Mode S Transponder ..................................... G-2
GEA 71 Engine/Airframe Unit .................................... G-2
GDL 69/69A Weather Data Link ................................. G-2
GRS 77 AHRS ............................................................. G-3
INDEX
Index ...................................................................... I-1

G1000
TM
System Overview

190-00498-00 Rev. A Garmin G1000 Pilot’s Guide for Cessna Nav III 1-1
SYSTEM OVERVIEW
1.1 SYSTEM DESCRIPTION
This document is designed to provide an overview
of the G1000 Integrated Cockpit System as installed in
Cessna Nav III aircraft.
The G1000 system includes the following Line
Replaceable Units (LRUs):
• GDU 1040 Primary Flight Display (PFD)
• GDU 1040 Multi Function Display (MFD)
• GIA 63 Integrated Avionics Units (2)
• GEA 71 Engine/Airframe Unit
• GDC 74A Air Data Computer (ADC)
• GRS 77 Attitude and Heading Reference System
(AHRS)
• GMU 44 Magnetometer
• GMA 1347 Audio System with integrated Marker
Beacon Receiver
• GTX 33 Mode-S Transponder
• GDL 69/69A Data Link
The LRUs are further described in the following
section. All LRUs have a modular design, which greatly
eases troubleshooting and maintenance of the G1000
system. A top-level G1000 block diagram is given in
Figure 1-1. Additional or optional interfaces are depicted
in Figure 1-2.
NOTE: Please refer to the Pilot’s Guide
Appendices for detailed specifications
regarding the G1000 LRUs.
1.2 LINE REPLACEABLE UNITS
• GDU 1040 – The GDU 1040 features a 10.4-inch
LCD display with 1024 x 768 resolution. The left
display is configured as a PFD and the right display
is configured as an MFD. Both GDU 1040s link
and display all functions of the G1000 system
during flight. The displays communicate with
each other through a High-Speed Data Bus (HSDB)
Ethernet connection. Each display is also paired via
an Ethernet connection with a GIA 63 Integrated
Avionics Unit.
• GMA 1347 – The GMA 1347 Audio Panel integrates
NAV/COM digital audio, intercom system and
marker beacon controls. The GMA 1347 also
controls manual display reversionary mode (red
DISPLAY BACKUP button) and is installed
between the MFD and the PFD. The GMA 1347
communicates with both GIA 63s using an RS-232
digital interface.

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Garmin G1000 Pilot’s Guide for Cessna Nav III
1-2
SYSTEM OVERVIEW
• GIA 63 – The GIA 63 is the central Integrated
Avionics Unit (IAU) of the G1000 system. The
GIA 63 functions as a main communication hub,
linking all LRUs with the PFD and the MFD
displays. Each GIA 63 contains a GPS receiver, VHF
COM/NAV/GS receivers, and system integration
microprocessors. Each GIA 63 is paired with a
respective GDU 1040 display through Ethernet.
The GIAs are not paired together and do not
communicate with each other directly.
• GRS 77 – The GRS 77 is an Attitude and Heading
Reference System (AHRS) that provides aircraft
attitude and heading information to both the
G1000 displays and the GIA 63s. The unit
contains advanced sensors, accelerometers and rate
sensors. In addition, the GRS 77 interfaces with
both the GDC 74A Air Data Computer and the
GMU 44 Magnetometer. The GRS 77 also utilizes
GPS signals sent from the GIA 63. Attitude and
heading information is sent using an ARINC 429
digital interface to both GDU 1040s and GIA 63s.
AHRS modes of operation are discussed later in this
document.
• GMU 44 – The GMU 44 Magnetometer measures
local magnetic field information. Data is sent to the
GRS 77 AHRS for processing to determine aircraft
magnetic heading. This unit receives power directly
from the GRS 77 and communicates with the
GRS 77 using an RS-485 digital interface.
• GDC 74A – The GDC 74A Air Data Computer
processes information from the pitot/static system
as well as the outside air temperature (OAT) sensor.
The GDC 74A provides pressure altitude, airspeed,
vertical speed and OAT information to the G1000
system, and communicates with the GIA 63s,
GDU 1040s and GRS 77 using an ARINC 429 digital
interface.
• GEA 71 – The GEA 71 receives and processes signals
from the engine and airframe sensors. Sensor types
include engine temperature and pressure sensors as
well as fuel measurement and pressure sensors. The
GEA 71 communicates with both GIA 63s using an
RS-485 digital interface.

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SYSTEM OVERVIEW
• GTX 33 – The GTX 33 is a solid-state, Mode-
S transponder that provides Modes A, C and S
operation. The GTX 33 is controlled through the
PFD and communicates with both GIA 63s through
an RS-232 digital interface.
• GDL 69/69A – The GDL 69/69A is an XM satellite
radio receiver that provides real-time weather
information to the G1000 MFD. The GDL 69A
also provides digital audio entertainment in the
cockpit. The GDL 69/69A communicates with the
MFD on the High-Speed Data Bus. A subscription
to the XM Satellite Radio service is required for the
GDL 69/69A to be used.

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Garmin G1000 Pilot’s Guide for Cessna Nav III
1-4
SYSTEM OVERVIEW
Figure 1-1 Basic G1000 System
No. 1 GIA 63
Integrated Avionics Unit
System Inegration Processors
I/O Processors
VHF COM
VHF NAV/LOC
GPS
Glideslope
No. 2 GIA 63
Integrated Avionics Unit
System Integration Processors
I/O Processors
VHF COM
VHF NAV/LOC
GPS
Glideslope
GTX 33
Transponder
High-Speed Data Bus (Ethernet)
Reversionary
Control
GEA 71
Engine/Airframe
Unit
GDC 74A
Air Data
Computer
OAT
Airspeed
Altitude
Vertical Speed
GRS 77
AHRS
Attitude
Rate of Turn
Slip/Skid
GMU 44
Magnetometer
Heading
GPSOutputGPSOutput
Reversionary
Control
GMA 1347
Audio Panel
GDU 1040 (PFD) GDU 1040 (MFD)
Honeywell
KAP 140
Autopilot
(If equipped)

190-00498-00 Rev. A Garmin G1000 Pilot’s Guide for Cessna Nav III 1-5
SYSTEM OVERVIEW
High-Speed Data Bus (Ethernet)
No. 2 GIA 63
Integrated Avionics Unit
System Integration Processors
I/O Processors
VHF COM
VHF NAV/LOC
GPS
Glideslope
L3
Stormscope
Lightning Strike and
Thunderstorm Detection
Honeywell
KR 87
ADF Receiver
Honeywell
KN 63
DME
GDL 69/69A
Data Link
Real-time Weather
Digital Audio Entertainment
CO Guardian
Carbon Monoxide
Detection
Figure 1-2 G1000 Optional Interfaces
NOTE: For information on all optional equipment shown in Figure 1-2, please consult the applicable
user’s guide supplied with the optional equipment. This document assumes that the reader is already
familiar with the operation of this additional equipment.

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Garmin G1000 Pilot’s Guide for Cessna Nav III
1-6
SYSTEM OVERVIEW
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