Humminbird 581i DI Combo User manual

581i DI Combo and 581i HD DI
Combo Operations anual
581i DI Combo and 581i HD DI
Combo Operations anual
531966-2 N_A

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 full
benefit from all the features and applications of your Humminbird® product.
To contact our Customer Resource Center, call 1-800-633-1468 or visit our
Web site at humminbird.com.
WA NING! 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.
WA NING! The electronic chart in your umminbird® 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.
WA NING! 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.
WA NING! This product contains chemicals known to the State of California to cause
cancer and/or reproductive harm.
WA NING! Do not travel at high speed with the unit cover installed. Remove the unit
cover before traveling at speeds above 20 mph.
WA NING! umminbird® 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. It 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 umminbird®
manual: SD Card Slot. Also, contact our Customer Resource Center with any questions.

NOTE: To purchase accessories for your control head, visit our Web site at
humminbird.com or contact our Customer Resource Center at 1-800-633-1468.
NOTE: 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. umminbird® is not responsible for incorrect translations or
discrepancies between documents.
NOTE: The illustrations in this manual may not look the same as your product, but your
unit will function in the same way.
OHS 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™, Down Imaging™, Fish ID+™, Humminbird®, HumminbirdPC™, RTS™, RTS
Window™, Structure ID®, SwitchFire™, WhiteLine™, UniMap™, and X-Press™ Menu are
trademarked by or registered trademarks of Humminbird®.
Baekmuk Batang, Baekmuk Dotum, 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 lectronics, Inc. All rights reserved.
NOTE: 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.
ATTENTION INTE NATIONAL CUSTOME S: Products sold in the U.S. are not
intended for use in the international market. Hummin ird® 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 Hummin ird® international units
purchased through our authorized international distri utors.
To o tain a list of authorized international distri utors, please visit our We site at
humminbird.com or contact our Customer Resource Center at [phone].

Power On 1
How Sonar Works 2
Down Imaging™ Sonar............................................................................................ 4
How GPS Works 5
What’s on the Sonar Display 6
Understanding the Sonar Display .......................................................................... 8
Real Time Sonar (RTS™) Window .......................................................................... 8
SwitchFire™ ............................................................................................................ 9
Freeze Frame and Active Cursor.............................................................................. 9
Instant Image Update .............................................................................................. 9
Sonar Returns and Bottom View .......................................................................... 10
What’s on the Down Imaging™ Display 12
Understanding the Down Imaging™ Display ...................................................... 14
Interpreting the Display ........................................................................................ 14
Down Imaging™ Sensitivity .................................................................................. 15
Freeze Frame and Active Cursor............................................................................ 15
Views 16
Sonar View ............................................................................................................ 18
Sonar Zoom View .................................................................................................. 19
Split Sonar View .................................................................................................... 20
Down Imaging™ View .......................................................................................... 21
Down/Sonar Combo View ......................................................................................22
Big Digits View ...................................................................................................... 23
Bird’s ye View ...................................................................................................... 24
Chart View .............................................................................................................. 25
Combo View .......................................................................................................... 27
Chart/Down Combo View...................................................................................... 28
View Orientation .................................................................................................... 29
Viewing Cartography.............................................................................................. 30
Table of Contents
i

ii
Introduction to Navigation 32
Waypoints, Routes, and Tracks ............................................................................ 32
Open the Waypoint Management Dialog Box .................................................... 34
What’s on the Waypoint Management Dialog Box ............................................ 35
Save, Create, or Delete a Waypoint...................................................................... 37
Navigate to a Waypoint or Position...................................................................... 38
Add a Waypoint Target or Trolling Grid ................................................................ 39
Routes .................................................................................................................... 40
Tracks...................................................................................................................... 42
dit your Waypoints, Routes, Tracks, and Groups .............................................. 43
What’s on the 500 Series™ Control Head 45
Key Functions 46
POW R/LIGHT Key ................................................................................................ 46
VI W Key................................................................................................................ 47
INFO Key ................................................................................................................ 47
M NU Key.............................................................................................................. 47
4-WAY Cursor Control Key .................................................................................... 48
MARK Key .............................................................................................................. 48
GOTO Key................................................................................................................ 49
ZOOM (+/-) Key...................................................................................................... 49
XIT Key.................................................................................................................. 49
SD Memory Card Slot 50
Add Maps to Your Fishfinder ................................................................................ 51
Import Navigation Data ........................................................................................ 51
xport Navigation Data.......................................................................................... 52
The Menu System 54
Start- p Options Menu 55
Normal.................................................................................................................... 55
Simulator................................................................................................................ 56
Table of Contents

Table of Contents
System Status ........................................................................................................ 56
Self Test .................................................................................................................. 57
Accessory Test........................................................................................................ 57
GPS Diagnostic View ............................................................................................ 58
X-Press™ Menu 59
Main Menu 60
Quick Tips for the Main Menu .................................................................................. 61
Note for all Menu Settings .......................................................................................... 61
User Mode (Normal or Advanced) .............................................................................. 62
Sonar X-Press™ Menu (Sonar Views only) 64
Cancel Navigation (only when navigating) ................................................................ 65
Sensitivity .............................................................................................................. 65
Upper Range (Advanced: Sonar and Big Digits Views only) .......................................... 66
Lower Range .......................................................................................................... 66
Chart Speed............................................................................................................ 67
Bottom View .......................................................................................................... 67
Bottom Lock (Sonar Zoom View only) ........................................................................ 67
Bottom Range (Sonar Zoom View only when Bottom Lock is On) ................................ 68
Down Imaging™ X-Press™ Menu (Down Imaging™ Views only) 69
Cancel Navigation (only when navigating) ................................................................ 70
Imaging Sensitivity ................................................................................................ 70
DI nhance ............................................................................................................ 70
Upper Range (Advanced) ........................................................................................ 71
Lower Range .......................................................................................................... 72
Chart Speed............................................................................................................ 72
Imaging Palette ...................................................................................................... 72
Navigation X-Press™ Menu (Navigation Views only) 73
Cancel Navigation (only when Navigating)................................................................ 74
Skip Next Waypoint (only when Navigating) ............................................................ 74
Waypoint [Name] (Only with an active cursor on a waypoint) .................................... 74
iii

Table of Contents
Cursor To Waypoint (Chart or Combo View only) ...................................................... 75
Chart Declutter ...................................................................................................... 75
Save Current Track ................................................................................................ 75
Clear Current Track ................................................................................................ 75
Save Current Route (only when Navigating) ............................................................ 75
Sonar Window (Combo View only) .......................................................................... 76
Reset XT (only when Navigating) ............................................................................ 76
Remove Target (only if Target is Active) .................................................................... 76
Remove Grid (only if Grid is Active)............................................................................ 76
Waypoint [Name] (Most recently-created waypoint) .................................................. 77
Alarms Menu Tab 78
Depth Alarm .......................................................................................................... 79
Fish ID Alarm.......................................................................................................... 79
Low Battery Alarm ................................................................................................ 79
Temp. Alarm .......................................................................................................... 80
Off Course Alarm .................................................................................................. 80
Arrival Alarm .......................................................................................................... 81
Drift Alarm.............................................................................................................. 81
Alarm Tone ............................................................................................................ 81
Timer Setup............................................................................................................ 82
Start Timer.............................................................................................................. 82
Stop Timer (with the Timer running) .......................................................................... 82
Sonar Menu Tab 83
Beam Select .......................................................................................................... 84
Imaging Frequency (Down Imaging™ Views only) .................................................... 85
Surface Clutter ...................................................................................................... 86
SwitchFire™ .......................................................................................................... 86
Fish ID+™ .............................................................................................................. 87
Fish ID Sensitivity .................................................................................................. 88
Real Time Sonar (RTS™) Window ........................................................................ 88
iv

Table of Contents
Zoom Width............................................................................................................ 88
455 kHz Sensitivity (Advanced, Down Imaging™ only) .............................................. 89
Depth Lines (Advanced) .......................................................................................... 89
Noise Filter (Advanced) ............................................................................................ 89
Max Depth (Advanced) ............................................................................................ 90
Water Type (Advanced) ............................................................................................ 90
Digital Depth Source (Advanced, optional-purchase transducers only) ........................ 91
DI Pings (Advanced, Down Imaging™ View and Chart/Down Combo View only) ............ 91
Imaging Palette (Down Imaging™ Views only) .......................................................... 92
Navigation Menu Tab 93
Current Track .......................................................................................................... 94
Waypoints, Routes, Tracks (Waypoint Management Dialog Box) .............................. 94
Waypoint Settings.................................................................................................. 95
Saved Tracks Defaults............................................................................................ 95
Chart Orientation.................................................................................................... 96
Casting Rings (Advanced) ........................................................................................ 96
Lat/Lon Grid............................................................................................................ 96
Chart Select (SD card in slot) .................................................................................... 96
North Reference .................................................................................................... 96
Waypoint Proximity Flags (Advanced) .................................................................... 97
Waypoint Decluttering (Advanced).......................................................................... 97
Grid Rotation .......................................................................................................... 98
Trackpoint Interval.................................................................................................. 98
Track Min Distance (Advanced) .............................................................................. 98
Map Datum (Advanced) .......................................................................................... 99
Set Simulation Position (Advanced) ........................................................................ 99
Set Map Offset (Advanced)...................................................................................... 99
Clear Map Offset (Advanced) ................................................................................ 100
North-Up Indicator .............................................................................................. 100
Course Projection Line ........................................................................................ 100
Chart Detail Level ................................................................................................ 101
v

Table of Contents
Map Borders ........................................................................................................ 102
Spot Soundings.................................................................................................... 103
Auto Zoom (Advanced) .......................................................................................... 103
Auto Range (Advanced) ........................................................................................ 103
Vessel Offset ........................................................................................................ 104
Offset Speed (with Vessel Offset turned on) ............................................................ 104
Setup Menu Tab 105
Units - Depth........................................................................................................ 106
Units - Temp (International only) ............................................................................ 106
Units - Distance .................................................................................................. 106
Units - Speed ...................................................................................................... 106
User Mode .......................................................................................................... 106
Language (International only).................................................................................. 107
Triplog Reset ........................................................................................................ 107
Restore Defaults .................................................................................................. 107
Format Nav Directories........................................................................................ 107
Select Readouts (Advanced, Sonar View and Down Imaging™ View only) ................ 108
Depth Offset (Advanced)........................................................................................ 109
Temp. Offset (Advanced, with Temp/Speed only)...................................................... 109
Speed Calibration (Advanced, with Temp/Speed only) ............................................ 109
Local Time Zone (Advanced).................................................................................. 109
Daylight Saving Time (Advanced).......................................................................... 110
Position Format (Advanced) .................................................................................. 110
Time Format (Advanced, International only) ............................................................ 110
Date Format (Advanced, International only).............................................................. 110
Digits Format (Advanced) ...................................................................................... 111
NM A 0183 Output (Advanced)............................................................................ 111
Sonar .................................................................................................................... 112
Demonstration...................................................................................................... 112
Sound Control ......................................................................................................112
vi

Table of Contents
Views Menu Tab 113
Maintenance 114
Troubleshooting 116
Fishfinder Doesn’t Power Up .............................................................................. 116
Fishfinder Defaults to Simulator with a Transducer Attached.......................... 116
Display Problems ................................................................................................ 117
Finding the Cause of Noise..................................................................................118
Specifications 119
Glossary 122
Contact Humminbird® 130
NOTE: Entries in this Table of Contents which list (International 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].
NOTE: Entries in this Table of Contents which list (with Temp/Speed only) require
the purchase of separate accessories. You can visit our Web site at
humminbird.com to order these accessories online or contact our Customer
Resource Center at 1-800-633-1468.
NOTE: 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.
vii

Power On
Follow the instructions below to power on your Humminbird® control head.
1. Press the POW R/LIGHT key.
2. When the Title screen is displayed, press the M NU 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 Options 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 Depth. Press the XIT key to close the
dialog box.
NOTE: The Quick Setup settings can be changed at any time. See each menu option
in The Menu System for details.
Title Screen
Power On
1

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 uses 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 LCD screen.
ach time a new echo is received, the old
echoes are moved across the LCD, creating
a scrolling effect.
How Sonar Works 2

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.
How Sonar Works
3

4
Down Imaging™ Sonar
Your Fishfinder uses Down Imaging™
technology. The Down Imaging™ transducer
scans the water with razor-thin, high-
definition beams. The beams are wide (side
to side) but very thin front to back.
The Down Imaging™ beams can be operated
at two frequencies: 455 kHz (75°) or 800 kHz
(45°). Select 455 kHz for the best overall
image quality and depth. Select 800 kHz for
the sharpest image. See Down Imaging™
X-Press™ Menu: Imaging Frequency for more
information.
The transducer also uses conical beams to
provide data in traditional 2D format (see
What’s on the Sonar Display). Select 455 kHz
for a narrowly focused 16° center beam, or
select 200 kHz for a wider 25° beam (see
Sonar Menu Tab: Beam Select).
Depth capability is affected by such factors
as boat speed, wave action, bottom hardness,
water conditions, and transducer installation.
75 Degree Total Coverage
16°
75°
25°
455kHz
200kHz
455kHz
45° 800kHz
How Sonar Works

5How GPS Works
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 +/- 10
meters, depending on conditions. This means that 95% of the time, the GPS
receiver will read a location within 10 meters of your actual position. Your GPS
Receiver also uses information from WAAS (the Wide Area Augmentation
System), GNOS (the uropean Geostationary Navigation 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.

What’s on the Sonar D splay
What’s on the Sonar Display
The 500 Series™ Fishfinder can display a variety of useful information about
NOTE: Entries in this view that list (with Temp/Speed or GPS Receiver) are available if either
the information from the GPS receiver will be displayed on the view.
Depth - Water depth; can e set to alarm when
the water ecomes too shallow.
Temperature - Water 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 - When the sonar signal
ounces etween the ottom and the surface of the
water and ack again. Use the appearance of the
second return to determine ottom hardness. Hard
ottoms will show a strong second return, while soft
ottoms will show a very weak one or none at all.
Cursor Dialog Box - Indicates cursor depth on
the display and the depth of the ottom directly
elow the cursor. The Latitude and Longitude of
the cursor position, the distance to travel to the
cursor position, and the earing to the cursor
position are shown with a GPS receiver. A
waypoint can e marked at the cursor position
for later retrieval and use with a GPS receiver.
Speed - If a Temp/Speed accessory or GPS
Receiver is attached, the Fishfinder can display
the speed of the oat and can keep a Triplog of
nautical or statute miles traveled.
6

the area under your boat, including the following items:
device is connected to the 500 Series™ Fishfinder. If both devices are connected, then only
RTS (Real Time Sonar) Window™
Structure - Where fish may e hiding.
Thermoclines - Layers of water with different
temperatures that appear at different depths
and different times of the year. A thermocline
typically appears as a continuous and of gray
levels moving across the display at the same
depth.
Bait Ball
Cursor - Availa le in Freeze Frame and can
e positioned in the Sonar View to provide
depth of a sonar return and ottom depth elow
the cursor.
Hollow Fish Symbol (See Fish ID+ )
Shaded Fish Symbol (See Fish ID+ )
Fish - The Fishfinder displays fish as arches
and/or fish icons, and can e set to alarm
when a fish of a certain size is detected.
When a target is detected, a Fish ID+™
sym ol appears on the display with the
depth displayed a ove it. The size of the
sym ol indicates the intensity of the sonar
return. The unit will clearly show schools of
Bait Fish as "clouds" of different shapes and
sizes, depending on the num er of fish and
oat speed.
What’s on the Sonar D splay
7

nderstanding the Sonar Display
It is important to understand the significance of
the display. The display does not show a literal
3-dimensional representation of what is under the
water. ach vertical band of data received by the
control head and plotted on the display represents
something that was detected by a sonar return at
a particular time. As both the boat and the targets
(fish) may be moving, the returns are only showing
a particular segment of time when objects were
detected, not exactly where those objects are in
relation to other objects shown on the display.
The returned sonar echoes are displayed on the screen. As a new echo is
received, the historical data scrolls across the screen.
Real Time Sonar (RTS™) Window
AReal Time Sonar (RTS™) Window appears on the right side of the display in
the Sonar View only. The RTS Window™ updates at the fastest rate possible for
depth conditions and shows only the returns from the bottom, structure, and
fish that are within the transducer beam. The RTS Window™ plots the depth
and intensity of a sonar return (see Sonar Menu Tab: TS Window™).
The Narrow RTS Window™
indicates the sonar intensity
through the use of grayscale.
The grayscale used matches
the Bottom View grayscale
setting (Inverse, StructureID
® ,
WhiteLine™, Bottom Black).
The depth of the sonar return
is indicated by the vertical
placement of the return on the
display depth scale.
The Wide RTS Window™
indicates the sonar intensity
through the use of a bar
graph. The length of the
plotted return indicates
whether the return is weak
or strong. The depth of the
sonar return is indicated by
the vertical placement of
the return on the display
depth scale. The Wide RTS
Window™ does not use
grayscale.
What’s on the Sonar D splay 8

What’s on the Sonar D splay
SwitchFire™
SwitchFire™ controls how the sonar returns are displayed in the Sonar Views.
SwitchFire™ settings are available in the Sonar Menu Tab.
To see the maximum sonar information available within the transducer beam so
more fish arches and better jig tracking are shown, choose Max Mode.
To see less clutter and more fish size accuracy interpreted from the transducer
beam, choose Clear Mode. See Sonar Menu Tab: SwitchFire™ for more
information.
Freeze Frame and Active Cursor
Freeze Frame & Active Cursor - Press any arrow on the 4-WAY Cursor Control
key, and the screen will freeze and a cursor will be displayed. Use the 4-WAY
Cursor Control key to move the cursor over a sonar return, and the depth of the
sonar return will be displayed at the bottom of the screen in the cursor
information box.
The RTS Window™ continues to update in Freeze Frame. To return to a scrolling
display and exit Freeze Frame, press the XIT key. Freeze Frame is available in
the Sonar, Split Sonar, and Sonar Zoom Views.
Instant Image pdate
Instant Image Update - You can change a variety of sonar menu settings (such
as Sensitivity or Upper Range), and the adjustments will be shown instantly on
the screen.
9

What’s on the Sonar Display
Sonar Returns and Bottom View
As the boat moves, the nit charts the
changes in depth on the display to create a
profile of the Bottom Contour. The Sonar
View displays the sonar ret rn intensity sing
gray scale.
Strong returns often res lt from rocky or hard
bottoms (compacted sediment, rocks, fallen
trees), while weaker returns often res lt from
soft bottoms (sand, m d), vegetation, and
small fish.
The shades sed to represent high, medi m,
to low intensity ret rns are determined by the
setting yo choose in the Bottom View men
option. See Sonar X-Press™ Menu to set the
Bottom View.
Sonar View:
Bottom View set to Inverse (default setting)
Strong Returns
(possibly rocks,
tree limbs, or
other structure)
RTS Window™
Sonar History:
Historical Returns
scroll left across
the iew.
Weak Returns
(possibly
egetation or
small fish)
Strong Return
(possibly
compacted
sediment or
rocks)
HIGH
Intensity Return
MEDIUM
Intensity Return
LOW
Intensity Return
Sonar Colors: Original Palette
10