Humminbird 598ci User manual

532077-1 N_A
598ci HD SI Combo
Operations anual
598ci HD SI Combo
Operations anual

Thank You!
Thank you for choosing Humminbird®, the #1 name in fishfinders.
Humminbird® has built its reputation by designing and manufacturing top-
quality, thoroughly reliable marine equipment. Your Humminbird® is
designed for trouble-free use in even the harshest marine environment. In
the unlikely event that your Humminbird® does require repairs, we offer an
exclusive Service Policy - free of charge during the first year after purchase,
and available at a reasonable rate after the one-year period. For complete
details, see the separate warranty card included with your unit. We
encourage you to read this operations manual carefully in order to get the full
benefit from all the features and applications of your Humminbird® product.
Contact our Customer Resource Center at 1-800-633-1468 or visit our Web
site at humminbird.com.
WARNING! This device should not be used as a navigational aid to prevent collision,
grounding, boat damage, or personal injury. When the boat is moving, water depth
may change too quickly to allow time for you to react. Always operate the boat at very
slow speeds if you suspect shallow water or submerged objects.
WARNING! The electronic chart in your Humminbird®unit is an aid to navigation
designed to facilitate the use of authorized government charts, not to replace them.
Only official government charts and notices to mariners contain all of the current
information needed for the safety of navigation, and the captain is responsible for their
prudent use.
WARNING! Disassembly and repair of this electronic unit should only be performed
by authorized service personnel. Any modification of the serial number or attempt to
repair the original equipment or accessories by unauthorized individuals will void the
warranty.
WARNING! This product contains chemicals known to the State of California to cause
cancer and/or reproductive harm.
WARNING! Do not travel at high speed with the unit cover installed. Remove the unit
cover before traveling at speeds above 20 mph.
WARNING! Humminbird®is not responsible for the loss of data files (waypoints,
routes, tracks, groups, recordings, etc.) that may occur due to direct or indirect damage
to the unit’s hardware or software. t is important to back up your control head’s data
files periodically. Data files should also be saved to your PC before restoring the unit’s
defaults or updating the software. See the following sections of your Humminbird®
manual: Snapshot and Recording View and SD Memory Card Slot. Also, contact our
Customer Resource Center with any questions.

N TE: The illustrations in this manual may not look exactly like the display on your
Humminbird®model, but your model will work in the same way.
N TE: Some features discussed in this manual require a separate purchase, and some
features are only available on international models. Every effort has been made to
clearly identify those features. Please read the manual carefully in order to understand
the full capabilities of your model.
N TE: To purchase accessories for your fishfinder, visit our Web site at
humminbird.com or contact our Customer Resource Center at 1-800-633-1468.
N TE: The procedures and features described in this manual are subject to change
without notice. This manual was written in English and may have been translated to
another language. Humminbird®is not responsible for incorrect translations or
discrepancies between documents.
R HS STATEMENT: Product designed and intended as a fixed installation or part of
a system in a vessel may be considered beyond the scope of Directive 2002/95/EC of
the European Parliament and of the Council of 27 January 2003 on the restriction of
the use of certain hazardous substances in electrical and electronic equipment.
500 Series™, own Imaging™, ualBeam PLUS™, Fish I +™, Humminbird®, HumminbirdPC™,
LakeMaster®, RTS™, RTS Window™, Side Imaging®, Structure I ®, SwitchFire™, UniMap™,
WhiteLine™, X-Press™ Menu, and Xtreme epth Series™ are trademarked by or registered
trademarks of Johnson Outdoors Marine Electronics, Inc.
Baekmuk Batang, Baekmuk otum, Baekmuk Gulim, and Baekmuk Headline are registered
trademarks owned by Kim Jeong-Hwan.
Navionics® Gold, HotMaps®, and HotMaps® Premium are registered trademarks of Navionics®.
© 2012 Johnson Outdoors Marine Electronics, Inc. All rights reserved.
ATTENTION INTERNATIONAL CU TOMER : Products sold in the U.S. are not
intended for use in the international market. Humminbird® international units
provide international features and are designed to meet country and regional
regulations. Languages, maps, time zones, units of measurement, and warranty
are examples of features that are customized for Humminbird® international units
purchased through our authorized international distributors.
To obtain a list of authorized international distributors, please visit our eb site at
humminbird.com or contact our Customer Resource Center at [phone].

Power On 1
How Sonar Works 2
Side Imaging® Sonar ................................................................................................ 4
ualBeam PLUS™ Sonar ........................................................................................ 5
ual Beam Ice Transducer (with optional-purchase X 9 20 ce Transducer) .................. 6
How GPS Works 7
What’s on the Sonar Display 8
Understanding the Sonar isplay.......................................................................... 10
Real Time Sonar (RTS™) Window ........................................................................ 10
SwitchFire™............................................................................................................ 11
Freeze Frame and Active Cursor ............................................................................ 11
Instant Image Update ............................................................................................ 11
Sonar Colors and Bottom View.............................................................................. 12
What’s on the Side Imaging® Display 14
Understanding the Side Imaging® isplay............................................................ 16
Side Imaging® Frequencies and Coverage............................................................ 18
For Best Performance ............................................................................................ 18
On the Water Interpretation .................................................................................. 20
What’s on the Down Imaging™ Display 24
Understanding the own Imaging™ isplay ...................................................... 26
Interpreting the isplay.......................................................................................... 26
own Imaging™ Sensitivity .................................................................................. 27
Freeze Frame and Active Cursor ............................................................................ 27
Views 28
Side Imaging® View................................................................................................ 30
own Imaging™ View .......................................................................................... 32
Sonar View.............................................................................................................. 34
Sonar Zoom View .................................................................................................. 35
Table of Contents
i

ii
Split Sonar View .................................................................................................... 36
Big igits View ...................................................................................................... 37
Circular Flasher View ............................................................................................ 38
Snapshot and Recording View .............................................................................. 43
Bird’s Eye View ...................................................................................................... 49
Chart View .............................................................................................................. 50
Combo View............................................................................................................ 52
Chart/Side Combo View ........................................................................................ 53
Chart/ own Combo View .................................................................................... 54
own/Side Combo View ........................................................................................ 55
Sonar/Side Combo View ........................................................................................ 56
own/Sonar Combo View...................................................................................... 57
own/Side/Sonar Combo View ............................................................................ 58
View Orientation .................................................................................................... 59
Viewing Cartography.............................................................................................. 60
Introduction to Navigation 62
Waypoints, Routes, and Tracks.............................................................................. 62
Open the Waypoint Management ialog Box...................................................... 64
What’s on the Waypoint Management ialog Box ............................................ 65
Save, Create, or elete a Waypoint ...................................................................... 67
Navigate to a Waypoint or Position ...................................................................... 68
Add a Waypoint Target or Trolling Grid ................................................................ 69
Routes .................................................................................................................... 70
Tracks ...................................................................................................................... 72
Edit your Waypoints, Routes, Tracks, and Groups................................................ 73
Man Overboard (MOB) Navigation........................................................................ 75
What’s on the 500 Series™ Control Head 77
Key Functions 78
POWER/LIGHT Key ................................................................................................ 78
VIEW Key ................................................................................................................ 79
Table of Contents

iii
CHECK/INFO key .................................................................................................... 79
MENU Key .............................................................................................................. 79
4-WAY Cursor Control Key .................................................................................... 80
MARK Key .............................................................................................................. 81
GOTO Key ................................................................................................................ 81
ZOOM (+/-) Key ...................................................................................................... 82
EXIT Key .................................................................................................................. 82
SD Memory Card Slot 83
Add Maps to Your Fishfinder ................................................................................ 84
Import Navigation ata.......................................................................................... 85
Export Navigation ata .......................................................................................... 85
Update Software .................................................................................................... 87
he Menu System 88
Start-Up Options Menu 89
Normal .................................................................................................................... 89
Simulator ................................................................................................................ 90
System Status ........................................................................................................ 90
Self Test .................................................................................................................. 91
Accessory Test ........................................................................................................ 91
GPS iagnostic View.............................................................................................. 92
X-Press™ Menu 93
Main Menu 94
Quick Tips for the Main Menu .............................................................................. 95
Note for all Menu Settings .................................................................................... 95
User Mode (Normal or Advanced) ........................................................................ 96
Sonar X-Press™ Menu (Sonar Views only) 98
Cancel Navigation (only when Navigating)................................................................ 99
Sensitivity................................................................................................................ 99
Table of Contents

iv
Upper Range (Advanced: Sonar, Split Sonar, Circular Flasher,
Big Digits, Sonar/Side Combo, and Down/Side/Sonar Combo Views only).................... 100
Lower Range ........................................................................................................ 100
Chart Speed .......................................................................................................... 101
Bottom Lock (Sonar Zoom View only) ...................................................................... 101
Bottom Range (Sonar Zoom View only when Bottom Lock is On)................................ 101
Side Imaging® X-Press™ Menu
(Side Imaging® Views only) 102
Cancel Navigation (only when Navigating).............................................................. 103
SI Side .................................................................................................................. 103
SI Sensitivity ........................................................................................................ 103
SI Enhance............................................................................................................ 104
SI Range................................................................................................................ 105
Chart Speed .......................................................................................................... 105
Imaging Colors...................................................................................................... 105
Down Imaging™ X-Press™ Menu
(Down Imaging™ Views only) 106
Cancel Navigation (only when Navigating).............................................................. 107
own Sensitivity .................................................................................................. 107
I Enhance............................................................................................................ 107
Upper Range (Advanced)........................................................................................ 108
Lower Range ........................................................................................................ 109
Chart Speed .......................................................................................................... 109
Imaging Colors...................................................................................................... 109
Flasher X-Press™ Menu (Circular Flasher View only) 110
Cancel Navigation (only when Navigating).............................................................. 111
Sensitivity.............................................................................................................. 111
Upper Range (Advanced)........................................................................................ 111
Lower Range ........................................................................................................ 112
Color Palette (Circular Flasher View, ce Fishing Mode only) ...................................... 112
Table of Contents

v
Snapshot and Recording X-Press™ Menu
(Snapshot and Recording View only) 113
Start Recording (optional-purchase SD Memory Card only)........................................ 114
Stop Recording (optional-purchase SD Memory Card only) ........................................ 114
elete Image (optional-purchase SD Memory Card) .................................................. 114
elete All Images (optional-purchase SD Memory Card) .......................................... 114
elete Recording (optional-purchase SD Memory Card only) .................................... 115
elete All Recordings (optional-purchase SD Memory Card only).............................. 115
Pings Per Second (optional-purchase SD Memory Card only) .................................... 115
Playback Speed (optional-purchase SD Memory Card only) ...................................... 116
Stop Playback (optional-purchase SD Memory Card only) .......................................... 117
Navigation X-Press™ Menu (Navigation Views only) 118
Cancel Navigation (only when Navigating).............................................................. 119
Cancel MOB Navigation (only when MOB Navigation is activated) .............................. 119
Skip Next Waypoint (only when Navigating) .......................................................... 119
Waypoint [Name] (only with an active cursor on a waypoint) .................................... 119
Cursor To Waypoint (Chart or Chart Combo Views only) .......................................... 120
Chart eclutter .................................................................................................... 120
Save Current Track .............................................................................................. 120
Clear Current Track .............................................................................................. 121
Save Current Route (only when Navigating)............................................................ 121
Sonar Window (Combo View and Chart/Combo View only) ...................................... 121
Reset XTE (only when navigating)............................................................................ 121
Remove Target (only if a Target is Active) ................................................................ 122
Remove Grid (only if a Grid is Active)........................................................................ 122
Waypoint [Name] (Most recently-created waypoint) ................................................ 122
Alarms Menu ab 123
epth Alarm.......................................................................................................... 124
Fish I Alarm ........................................................................................................ 124
Low Battery Alarm................................................................................................ 124
Temp. Alarm (with optional-purchase Temp/Speed only)............................................ 125
Table of Contents

vi
Off Course Alarm.................................................................................................. 125
Arrival Alarm ........................................................................................................ 126
rift Alarm ............................................................................................................ 126
Alarm Tone............................................................................................................ 126
Timer Setup .......................................................................................................... 127
Start Timer ............................................................................................................ 127
Stop Timer (with the Timer running) ........................................................................ 127
Sonar Menu ab 128
Beam Select ........................................................................................................ 129
Surface Clutter...................................................................................................... 130
SwitchFire™.......................................................................................................... 130
Fish I +™ ............................................................................................................ 131
Fish I Sensitivity ................................................................................................ 132
Real Time Sonar (RTS™) Window ...................................................................... 132
Sonar Colors (Sonar View, Sonar Zoom View,
Circular Flasher View, Big Digits View, and Sonar Combo Views) .............................. 133
Bottom View ........................................................................................................ 133
Zoom Width .......................................................................................................... 134
83 kHz Sensitivity (Advanced) ................................................................................ 134
epth Lines (Advanced).......................................................................................... 134
SI Range Lines (Advanced, Side maging® View only) .............................................. 135
Noise Filter (Advanced) .......................................................................................... 136
Max epth (Advanced) .......................................................................................... 136
Water Type (Advanced) .......................................................................................... 137
Connected Transducer ........................................................................................ 137
own Imaging™ Beam Width (Advanced, Down maging™ Views only) ................ 138
Ice Fishing Mode.................................................................................................. 138
Navigation Menu ab 139
Current Track ........................................................................................................ 140
Waypoints, Routes, Tracks (Waypoint Management Dialog Box) ............................ 141
Waypoint Settings................................................................................................ 141
Saved Tracks efault............................................................................................ 142
Table of Contents

vii
Chart Orientation.................................................................................................. 142
Casting Rings........................................................................................................ 142
North Reference .................................................................................................. 143
Waypoint Proximity Flags (Advanced) .................................................................. 143
Waypoint ecluttering (Advanced) ........................................................................ 144
Trolling Grid Rotation............................................................................................ 144
Trackpoint Interval................................................................................................ 144
Track Min istance (Advanced).............................................................................. 145
Track Color Range ................................................................................................ 145
Map atum (Advanced).......................................................................................... 145
North-Up Indicator .............................................................................................. 145
Course Projection Line ........................................................................................ 146
Continuous Navigation Mode.............................................................................. 146
SI Navigation (Side maging® Views only) ................................................................ 146
Chart Menu ab 147
Lat/Lon Grid .......................................................................................................... 148
Navaids on Bird’s Eye View ................................................................................ 148
Chart Select .......................................................................................................... 148
Set Simulation Position (Advanced) ...................................................................... 148
Set Map Offset (Advanced) .................................................................................... 149
Clear Map Offset (Advanced) ................................................................................ 149
Shaded epth ...................................................................................................... 149
Chart etail Level ................................................................................................ 150
Map Borders ........................................................................................................ 151
Spot Soundings .................................................................................................... 152
Auto Zoom (Advanced) .......................................................................................... 152
Auto Range (Advanced).......................................................................................... 152
Vessel Offset (Advanced)........................................................................................ 152
Offset Speed (with Vessel Offset turned on).............................................................. 153
Contour Lines (optional-purchase LakeMaster® charts only) ...................................... 153
epth Colors (optional-purchase LakeMaster® charts only) ........................................ 153
Table of Contents

viii
epth Highlight (optional-purchase LakeMaster® charts only).................................... 153
epth Highlight Range (+/-) (optional-purchase LakeMaster® charts only) .............. 154
Water Level Offset (optional-purchase LakeMaster® charts only) ................................154
Shallow Water Highlight (optional-purchase LakeMaster® charts only) .................... 154
Lake List (optional-purchase LakeMaster® charts only)................................................ 155
Setup Menu ab 156
Units - epth ........................................................................................................ 157
Units - Temp ( nternational only).............................................................................. 157
Units - istance.................................................................................................... 157
Units - Speed ........................................................................................................ 157
User Mode .......................................................................................................... 157
Language ( nternational Models only) ...................................................................... 158
Triplog Reset ........................................................................................................ 158
Restore efaults .................................................................................................. 158
Format Nav irectories ........................................................................................ 158
Select Readouts (Advanced, Sonar View and Down maging™ View only).................. 159
epth Offset (Advanced) ........................................................................................ 160
Temp. Offset (Advanced, with Temp/Speed only) ...................................................... 160
Speed Calibration (Advanced, with Temp/Speed only) .............................................. 160
Local Time Zone (Advanced) .................................................................................. 160
aylight Saving Time (Advanced) .......................................................................... 161
Position Format (Advanced).................................................................................... 161
Time Format (Advanced, nternational only) .............................................................. 161
ate Format (Advanced, nternational only) .............................................................. 161
igits Format (Advanced) ...................................................................................... 162
NMEA 0183 Output (Advanced) ............................................................................ 162
Sonar .................................................................................................................... 163
emonstration ...................................................................................................... 163
Sound Control ...................................................................................................... 163
Screen Snapshot .................................................................................................. 163
Table of Contents

ix
Views Menu ab 165
Maintenance 166
roubleshooting 168
Fishfinder oesn’t Power Up .............................................................................. 168
Fishfinder efaults to Simulator with a Transducer Attached .......................... 168
isplay Problems.................................................................................................. 169
Finding the Cause of Noise.................................................................................. 170
Specifications 171
Glossary 173
Contact Humminbird® 181
N TE: Entries in this Table of Contents which list ( nternational only) are only
available on products sold outside of the U.S. by our authorized international
distributors. To obtain a list of authorized international distributors, please visit
our Web site at humminbird.com or contact our Customer Resource Center at
[phone].
N TE: Entries in this Table of Contents which list (with Temp/Speed only)
require the purchase of separate accessories. Visit our Web site at
humminbird.com to order these accessories online or contact our Customer
Resource Center at 1-800-633-1468.
N TE: Some features discussed in this manual require a separate purchase,
and some features are only available on international models. Every effort has
been made to clearly identify those features. Please read the manual carefully
in order to understand the full capabilities of your model.
Table of Contents

Power On
Follow the instructions below to power on your Humminbird® control head.
1. Press the POWER/LIGHT key.
2. When the Title screen is displayed, press the MENU key to access the
Start-Up Options Menu.
3. If a functioning transducer is connected, Normal operation will be
selected automatically, and your Fishfinder can be used on the water.
See Start-Up ptions Menu for more information.
•If a transducer is not connected and you wait too long to select a
Start-Up Option, the system will default to whichever menu is
already highlighted.
• You can also select Simulator to learn how to use your control
head and save settings in advance for later use.
4. Quick Setup: If this is the first time the unit has been powered on (after
installation or after restoring defaults), the Quick Setup dialog box will
display on the screen. Use the 4-WAY Cursor Control key to set the
Language, Water Type, and Max epth. Press the EXIT key to close the
dialog box.
N TE: The Quick Setup settings can be changed at any time. See each menu
option in The Menu System for details.
Title creen
1Pow r On

2
How Sonar Works
Sonar technology is based on sound waves. The 500 Series™ Fishfinder uses
sonar to locate and define structure, bottom contour and composition, as well
as depth directly below the transducer.
Your 500 Series™ Fishfinder sends a sound wave signal and determines
distance by measuring the time between the transmission of the sound wave
and when the sound wave is reflected off of an object; it then uses the reflected
signal to interpret location, size, and composition of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth of
240 ft (70 m) and back again in less than 1/4 of a second. It is unlikely that your
boat can “outrun“ this sonar signal.
SONAR is an acronym for SOund and
NAvigation Ranging. Sonar utilizes precision
sound pulses or “pings“ which are emitted
into the water in a teardrop-shaped beam.
The sound pulses “echo“ back from objects
in the water such as the bottom, fish, and
other submerged objects. The returned
echoes are displayed on the LC screen.
Each time a new echo is received, the old
echoes are moved across the LC , creating
a scrolling effect.
How Sonar Works

3How Sonar Works
When all the echoes are viewed side by side, an
easy to interpret “graph“ of the bottom, fish, and
structure appears.
The sound pulses are transmitted at various
frequencies depending on the application. Very
high frequencies (455 kHz) are used for greatest
definition but the operating depth is limited. High
frequencies (200 kHz) are commonly used on
consumer sonar and provide a good balance
between depth performance and resolution. Low
frequencies (83 kHz) are typically used to achieve
greater depth capability.
The power output is the amount of energy
generated by the sonar transmitter. It is commonly
measured using two methods:
• Root Mean Square (RMS) measures power
output over the entire transmit cycle.
• Peak to Peak measures power output at the
highest points.
The benefits of increased power output are the
ability to detect smaller targets at greater distances,
ability to overcome noise, better high speed
performance, and enhanced depth capability.

4
Side Imaging® Sonar
Your 598ci HD SI Fishfinder uses
Side Imaging® sonar to provide a
wide yet precise survey of a large
area of water, including detailed
bottom topography and fish-
attracting structure orientation. The
Side Imaging® transducer returns
are processed into an image similar
to an aerial photograph.
Typically, the Side Imaging® sonar
can search an area that is 240 feet
wide to each side, 480 feet total
coverage, with a depth limitation
of 150 feet. See What’s on
the Side Imaging® Display and
Understanding the Side Imaging®
Display for more information.
The Side Imaging® transducer also
provides down imaging displays on
the screen. See What’s on the
Down Imaging™ Display for more
information.
epth capability is affected by such
factors as boat speed, wave action,
bottom hardness, water conditions,
and transducer installation.
60°
83kHz
20°
200kHz
86°
455kHz
86°
455kHz
180 Degree Total Coverage
How Sonar Works

5How Sonar Works
DualBeam PLUS™ Sonar
Your 598ci HD SI Fishfinder uses a
200/83 kHz ualBeam PLUS™ sonar system with
a wide (60°) area of coverage. ualBeam PLUS™
sonar has a narrowly focused 20° center beam,
surrounded by a second beam of 60°, expanding
your coverage to an area equal to your depth. In
20 feet of water, the wider beam covers an area
20 feet wide.
ualBeam PLUS™ sonar returns can be blended
together, viewed separately, or compared side-
by-side. ualBeam PLUS™ is ideal for a wide
range of conditions - from shallow to very deep
water in both fresh and salt water. epth
capability is affected by such factors as boat
speed, wave action, bottom hardness, water
conditions, and transducer installation.

6
Dual Beam Ice Transducer
(with optional-purchase XI 9 20 Ice Transducer)
The XI 9 20 Ice Transducer provides
selectable dual-frequency sonar with a
wide area of coverage. Selectable dual-
frequency gives you the option of two
beams, and both beams will cover the
bottom and provide high definition. The
20° center beam provides the highest
definition, while the 60° beam provides
wider coverage. epth capability is
affected by such factors as bottom
hardness and water conditions. Whether
fishing in shallow or very deep water,
selectable dual-frequency is ideal for a
variety of conditions.
N TE: Contact our Customer Resource
Center to determine which accessory
transducers are compatible with your
Humminbird® Fishing System, or visit our
Web site at humminbird.com.
How Sonar Works

7
How GPS Works
Your 500 Series™ Fishfinder also supports GPS (Global Positioning System) and
chartplotting. It uses GPS and sonar to determine your position, display it on a
grid, and provide detailed underwater information.
GPS uses a constellation of satellites that
continually send radio signals to the earth. The
GPS receiver on your boat receives signals from
satellites that are visible to it. Based on time
differences between each received signal, the GPS
receiver determines its distance to each satellite.
With distances known, the GPS receiver
mathematically triangulates its own position. With
5 updates per second, the GPS receiver then
calculates its velocity and bearing.
GPS was originally intended for military use; however, civilians may also take
advantage of its highly accurate position capabilities, typically within +/- 4.5
meters, depending on conditions. This means that 95% of the time, the GPS
receiver will read a location within +/- 4.5 meters of your actual position. Your
GPS Receiver also uses information from WAAS (the Wide Area Augmentation
System), EGNOS (the European Geostationary Navigations Overlay Service),
and MSAS (the MTSAT Satellite Augmentation System) satellites if they are
available in your area.
The following GPS functionality is currently supported by the 500 Series™
Fishfinder when it is connected to the included GPS receiver:
• View current position
• View current track (breadcrumb trail)
• View precision speed and heading from your GPS receiver
• Save tracks, waypoints, and routes
• Travel a route and navigate from one waypoint to the next
See Chart View and SD Memory Card Slot: Add Maps to Your Fishfinder for
more information.
How GPS Works

8
What’s on th Sonar Display
What’s on the Sonar Display
The 500 Series™ Fishfinder can display a variety of useful information about the
N TE: Entries in this view that list (with Temp/Speed or GPS Receiver) are available if
then only the information from the GPS receiver will be displayed on the view.
Depth - ater depth can be set to alarm
when the water becomes too shallow.
Temperature - ater surface temperature.
Timer - Elapsed time with Temp/Speed
Accessory or GPS Receiver.
Distance - Distance traveled with
Temp/Speed Accessory or GPS Receiver.
Average Speed - Average speed reading
with Temp/Speed Accessory or GPS Receiver.
Second Sonar Return - hen the sonar signal
bounces between the bottom and the surface
of the water and back again. Use the
appearance of the second return to determine
bottom hardness. Hard bottoms will show a
strong second return, while soft bottoms will
show a very weak one or none at all.
Speed - If a GPS Receiver or Temp/Speed
accessory is connected, the Fishfinder can
display the speed of the boat and can keep a
Triplog of nautical or statute miles traveled.
Cursor Dialog Box - Indicates cursor depth
on the display and the depth of the bottom
directly below the cursor. The Latitude and
Longitude of the cursor position, the
distance to travel to the cursor position, and
the bearing to the cursor position is shown
with a GPS receiver. A waypoint can be
marked at the cursor position for later
retrieval and use with a GPS receiver.