Humminbird 788ci HD DI User manual

A
788ci HD, 788ci HD DI,
& 788ci HD XD Combo
Operations Manual
788ci HD, 788ci HD DI,
& 788ci HD XD Combo
Operations Manual
531833-3 N_A

Thank You!
Thank you for choosing Humminbird®, America's #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.
ontact our ustomer Resource enter 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! 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! 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: Snapshot and Recording View, SD Card Slot, and PC Connect. 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
umminbird® 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.
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.
700 Series™, annon®, annonLink™, ontour XD™, Down Imaging™, DualBeam PLUS™,
Fish ID+™, Humminbird®, HumminbirdP ™, InterLink™, LakeMaster®, ProMap™,
QuadraBeam PLUS™, RTS™, RTS Window™, Structure ID®, WeatherSense®, WhiteLine™,
WideSide®, UniMap™, X-Press™ Menu, and Xtreme Depth Series™ are trademarked by or
registered trademarks of Johnson Outdoors Marine Electronics, Inc.
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®.
XM WX® is a registered trademark of XM Satellite Radio and Weather to the Power of X® is a
registered trademark of XM Satellite Radio Inc. All rights reserved.
© 2011 Johnson Outdoors Marine Electronics, Inc. All rights reserved.
ATTENTION INTERNATIONAL CU TOMER : Produ ts 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 ountry and regional
regulations. Languages, maps, time zones, units of measurement, and warranty
are examples of features that are ustomized for Humminbird® international
units pur hased through our authorized international distributors.
To obtain a list of authorized international distributors, please visit our Web
site at humminbird.com or onta t our Customer Resour e Center at
[phone].

Power On 1
How onar Works 2
DualBeam PLUS™ Sonar (DualBeam PLUS™models only [788ci D]) .......................... 4
Down Imaging™ Sonar (Down Imaging™ models only [788ci D DI])..............................5
Xtreme Depth Sonar (Xtreme Depth Series™ models only [788ci D XD]) ........................6
Dual Beam Ice Transducer (with optional-purchase XI 9 20 Ice Transducer) .................... 7
QuadraBeam PLUS™ Sonar
(with optional-purchase QuadraBeam PLUS™ transducer) .............................................. 8
WideSide® Sonar (with optional-purchase WideSide® transducer) .................................. 9
Universal Sonar 2 (compatible w/ optional-purchase Minnkota trolling motors) .............. 10
How GP Works 10
What’s on the Control Head 12
Key Functions 13
POWER/LIGHT Key .................................................................................................. 13
VIEW Key ................................................................................................................ 13
ZOOM (+/-) Key........................................................................................................ 14
4-WAY ursor ontrol Key ...................................................................................... 14
HE K/INFO Key...................................................................................................... 15
MENU Key .............................................................................................................. 16
MARK Key ................................................................................................................ 16
GOTO Key.................................................................................................................. 17
VIEW PRESET Keys .................................................................................................. 17
EXIT Key .................................................................................................................. 17
D Memory Card lots 18
Add Maps to Your Fishing System.......................................................................... 19
Export Navigation Data............................................................................................ 20
Update Software ...................................................................................................... 22
Accessory Bus 23
Table of Contents
i

ii
What’s on the onar Display 24
Understanding the Sonar Display ........................................................................ 26
Real Time Sonar (RTS™) Window ........................................................................ 26
Sonar olors and Bottom View ............................................................................ 27
SwitchFire™ .......................................................................................................... 29
Freeze Frame and Active ursor .......................................................................... 29
Instant Image Update............................................................................................ 29
What’s on the Down Imaging™ Display
(Down Imaging™ models only [788ci HD DI]) 30
Understanding the Down Imaging™ Display ...................................................... 32
Interpreting the Display ........................................................................................ 32
Down Imaging™ Sensitivity.................................................................................. 33
Freeze Frame and Active ursor .......................................................................... 33
Views 34
ustomize your View Rotation.............................................................................. 34
Program each PRESET Key.................................................................................... 35
hange the Digital Readouts ................................................................................ 35
Sonar View ............................................................................................................ 36
Sonar Zoom View .................................................................................................. 37
Split Sonar View .................................................................................................... 38
Big Digits View ...................................................................................................... 39
Down Imaging™ View (Down Imaging™ models only [788ci D DI]).......................... 40
ircular Flasher View ............................................................................................ 42
Snapshot and Recording View.............................................................................. 47
Side Beam View (with optional-purchase QuadraBeam PLUS™ transducer).................. 54
WideSide® View (with optional-purchase WideSide® transducer) ................................ 58
Bird’s Eye View ...................................................................................................... 59
hart View.............................................................................................................. 60
hart/Sonar ombo View...................................................................................... 62
Table of Contents

iii
hart/Down Imaging™ ombo View (Down Imaging™ models only [788ci D DI]) ...... 63
Down Imaging™/Sonar ombo View (Down Imaging™ models only [788ci D DI])...... 64
hart View Orientation ............................................................................................ 65
Viewing artography .............................................................................................. 66
Introduction to Navigation 69
Waypoints, Routes, and Tracks .............................................................................. 69
Open the Waypoint Management Dialog Box ...................................................... 71
What’s on the Waypoint Management Dialog Box .............................................. 72
Save, reate, or Delete a Waypoint........................................................................ 74
Navigate to a Waypoint or Position........................................................................ 75
Add a Waypoint Target or Trolling Grid .................................................................. 76
Routes ...................................................................................................................... 77
Tracks........................................................................................................................ 79
Edit your Waypoints, Routes, Tracks, and Groups ................................................ 80
Man Overboard (MOB) Navigation ........................................................................ 82
The Menu ystem 84
tart-Up Options Menu 85
Normal...................................................................................................................... 85
Simulator ................................................................................................................ 86
System Status ........................................................................................................ 86
Self Test .................................................................................................................... 87
Accessory Test.......................................................................................................... 87
GPS Diagnostic View .............................................................................................. 88
P onnect and Software Updates
(with optional-purchase PC Connect cable only) .......................................................... 88
X-Press™ Menu 90
Main Menu 91
Quick Tips for the Main Menu................................................................................ 92
Note for all Menu Settings...................................................................................... 93
User Mode (Normal or Advanced).......................................................................... 94
Table of Contents

iv
onar X-Press™ Menu (Sonar Views only) 96
ancel Navigation (only when Navigating) .............................................................. 97
Side (with optional-purchase WideSide® transducer, WideSide® View only) .................... 97
Sensitivity .............................................................................................................. 98
Upper Range (Advanced: Sonar, Split Sonar,
Circular Flasher, and Big Digits Views only).................................................................... 98
Lower Range ........................................................................................................ 99
Side Beam Range (with optional-purchase WideSide® transducer,
WideSide® View only)............................................................................................ 100
hart Speed ........................................................................................................ 101
Quad Layout (with optional-purchase QuadraBeam PLUS™ Transducer,
Side Beam View only) .......................................................................................... 101
Bottom Lock (Sonar Zoom View only) ...................................................................... 101
Bottom Range (Sonar Zoom View only when Bottom Lock is On) .............................. 102
Down Imaging™ X-Press™ Menu
(Down Imaging™ Views only [788ci HD DI]) 103
ancel Navigation (only when Navigating) ............................................................ 104
Down Sensitivity.................................................................................................. 104
DI Enhance .......................................................................................................... 104
Upper Range (Advanced) ...................................................................................... 105
Lower Range........................................................................................................ 106
hart Speed ........................................................................................................ 106
Imaging olors .................................................................................................... 106
Flasher X-Press™ Menu (Circular Flasher View only) 107
ancel Navigation (only when Navigating) ............................................................ 108
Sensitivity ............................................................................................................ 108
Upper Range (Advanced: Sonar, Split Sonar, Circular Flasher,
and Big Digits Views only) .................................................................................... 108
Lower Range ...................................................................................................... 109
olor Palette (Circular Flasher View, Ice Fishing Mode only) ...................................... 110
napshot and Recording X-Press™ Menu
(Snapshot and Recording View only) 111
Start Recording (optional-purchase SD Memory Card,
Snapshot and Recording View only) ...................................................................... 112
Table of Contents

v
Stop Recording (optional-purchase SD Memory Card only).......................................... 112
Delete Image (optional-purchase SD Memory Card,
Snapshot and Recording View only) ........................................................................ 112
Delete All Images (optional-purchase SD Memory Card,
Snapshot and Recording View only)..........................................................................112
Delete Recording (optional-purchase SD Memory Card,
Snapshot and Recording View only) ........................................................................ 113
Delete All Recordings (optional-purchase SD Memory Card,
Snapshot and Recording View only) ........................................................................ 113
Pings Per Second (optional-purchase SD Memory Card,
Snapshot and Recording View only) ........................................................................ 113
Playback Speed (optional-purchase SD Memory Card,
Snapshot and Recording View only) ........................................................................ 114
Stop Playback (optional-purchase SD Memory Card only)............................................ 115
Navigation X-Press™ Menu (Navigation Views only) 116
ancel Navigation (only when Navigating) .............................................................. 117
Skip Next Waypoint (only when Navigating) ............................................................ 117
Waypoint [Name] (only with an active cursor on a waypoint)...................................... 117
ursor To Waypoint (Chart or Combo View only) ...................................................... 118
Save urrent Track ................................................................................................ 118
lear urrent Track ................................................................................................ 118
Save urrent Route (only when Navigating) ............................................................ 118
ancel MOB Navigation (only when MOB Navigation is activated) ............................ 119
Remove Target (only if a Target is Active) .................................................................. 119
Remove Grid (only if a Grid is Active) ........................................................................ 119
Sonar Window (Combo View only) .......................................................................... 119
Waypoint [Name] (Most recently-created waypoint) .................................................. 120
Reset XTE (only when Navigating) ............................................................................ 120
hart Declutter ...................................................................................................... 121
Alarms Menu Tab 122
Depth Alarm .......................................................................................................... 123
Fish ID Alarm.......................................................................................................... 123
Low Battery Alarm ................................................................................................ 123
Table of Contents

vi
Temp. Alarm ........................................................................................................ 124
Off ourse Alarm ..................................................................................................124
Arrival Alarm ........................................................................................................ 125
Drift Alarm............................................................................................................ 125
Alarm Tone .......................................................................................................... 125
Timer Setup.......................................................................................................... 126
Start Timer............................................................................................................ 126
Stop Timer (with the Timer running) ........................................................................ 126
onar Menu Tab 127
Beam Select ........................................................................................................ 128
Imaging Frequency (Down Imaging™ Views only [788ci D DI])................................130
Surface lutter .................................................................................................... 131
SwitchFire™ ........................................................................................................ 131
Fish ID+™ ............................................................................................................ 132
Fish ID Sensitivity ................................................................................................ 133
Real Time Sonar (RTS™) Window ...................................................................... 133
Sonar olors (Sonar View, Sonar Zoom View,
Circular Flasher View, and Big Digits View) ............................................................ 134
Bottom View ........................................................................................................ 134
Zoom Width ........................................................................................................ 135
50 kHz Sensitivity (Advanced, XD Sonar only [788ci D XD]) .................................... 135
83 kHz Sensitivity (Advanced, DualBeam PLUS™ Sonar only [788ci D]) .................. 135
455 kHz Sensitivity (Advanced, Down Imaging™ Views only [788ci D DI]) ................135
455 kHz Sensitivity (Advanced, with optional-purchase
QuadraBeam PLUS™ transducer)................................................................................136
WideSide® Sensitivity (with optional-purchase WideSide® transducer,
WideSide® View only).......................................................................................... 136
Depth Lines (Advanced) ........................................................................................ 137
Noise Filter (Advanced).......................................................................................... 138
Max Depth (Advanced) .......................................................................................... 138
Water Type (Advanced) .......................................................................................... 139
Transducer Select ................................................................................................ 139
DI Pings (Advanced, Down Imaging™ View and Chart/Down Imaging™
Combo View only [788ci D DI])............................................................................ 140
Table of Contents

vii
Ice Fishing Mode .................................................................................................. 140
Imaging olors (Down Imaging™ Views only [788ci D DI]) ........................................140
Navigation Menu Tab 141
urrent Track.......................................................................................................... 142
Waypoints, Routes, Tracks (Waypoint Management Dialog Box) .............................. 143
Waypoint Settings ................................................................................................ 143
Saved Tracks Defaults............................................................................................ 144
hart Orientation .................................................................................................. 144
asting Rings (Advanced)........................................................................................ 144
North Reference .................................................................................................... 145
Waypoint Proximity Flags (Advanced) .................................................................... 145
Waypoint Decluttering (Advanced) ........................................................................ 146
Trolling Grid Rotation ............................................................................................ 146
Trackpoint Interval ................................................................................................ 146
Track Min Distance (Advanced) .............................................................................. 147
Track olor Range.................................................................................................. 147
Map Datum (Advanced) .......................................................................................... 147
ourse Projection Line .......................................................................................... 148
ontinuous Navigation Mode .............................................................................. 148
GPS Receiver Override (Advanced).......................................................................... 148
Chart Menu Tab 149
Lat/Lon Grid............................................................................................................ 150
Navaids on Bird’s Eye View .................................................................................. 150
hart Select............................................................................................................ 150
Set Simulation Position (Advanced) ........................................................................ 150
Set Map Offset (Advanced) .................................................................................... 151
lear Map Offset (Advanced) .................................................................................. 151
North-Up Indicator ................................................................................................ 151
Shaded Depth ........................................................................................................ 151
hart Detail Level .................................................................................................. 152
Map Borders .......................................................................................................... 153
Spot Soundings...................................................................................................... 154
Auto Zoom (Advanced) ............................................................................................ 154
Auto Range (Advanced) .......................................................................................... 154
Table of Contents

viii
Vessel Offset .......................................................................................................... 155
Offset Speed (with Vessel Offset turned on) .............................................................. 155
ontour Lines (optional-purchase LakeMaster® charts only) ........................................ 155
Depth olors (optional-purchase LakeMaster® charts only).......................................... 155
Depth Highlight (optional-purchase LakeMaster® charts only) .................................... 156
Depth Highlight Range (+/-) (optional-purchase LakeMaster® charts only) ................ 156
Water Level Offset (optional-purchase LakeMaster® charts only)..................................156
Shallow Water Highlight (optional-purchase LakeMaster® charts only) ...................... 156
Lake List (optional-purchase LakeMaster® charts only) ................................................ 157
etup Menu Tab 158
Units - Depth.......................................................................................................... 159
Units - Temp (International Models only) .................................................................. 159
Units - Distance .................................................................................................... 159
Units - Speed ........................................................................................................ 159
User Mode ............................................................................................................ 160
Language (International Models only) ........................................................................ 160
Triplog Reset ........................................................................................................ 160
Restore Defaults .................................................................................................... 160
Select Readouts (Advanced, Sonar View only) .......................................................... 161
Depth Offset (Advanced).......................................................................................... 162
Temp. Offset (Advanced, with Temp/Speed only)........................................................ 162
Speed alibration (Advanced, with Temp/Speed only) .............................................. 163
Local Time Zone (Advanced).................................................................................... 163
Daylight Saving Time (Advanced)............................................................................ 163
Position Format (Advanced) .................................................................................... 163
Time Format (Advanced, International Models only).................................................... 164
Date Format (Advanced, International Models only) .................................................... 164
Digits Format (Advanced) ........................................................................................ 164
NMEA Output (Advanced) ...................................................................................... 165
Sonar ...................................................................................................................... 165
Demonstration........................................................................................................ 166
Sound ontrol ........................................................................................................ 166
Table of Contents

Views Menu Tab 167
Accessories Menu Tab 168
Screen Snapshot.................................................................................................... 169
AIS (optional-purchase AIS equipment only) ................................................................ 169
Troubleshooting 174
Fishing System Doesn’t Power Up........................................................................ 174
Fishing System Defaults to Simulator with a Transducer Attached .................. 174
Display Problems.................................................................................................... 175
Finding the ause of Noise .................................................................................. 176
pecifications 177
Glossary 182
Contact Humminbird® 190
N TE: 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].
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 accessories online or contact our Customer Resource Center at
1-800-633-1468.
N TE: Contact our Customer Resource Center to determine which accessory
transducers are compatible with your umminbird®Fishing System, or visit our
Web site at humminbird.com.
ix
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 Fishing System 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 ursor ontrol key to set the
Language, Water Type, and Max Depth. 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.
788ci HD Title creen
1Power On

2
How Sonar Works
Sonar technology is based on sound waves. The 700 Series™ Fishing System
uses sonar to locate and define structure, bottom contour and composition, as
well as depth directly below the transducer.
Your 700 Series™ Fishing System 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 L D screen.
Each time a new echo is received, the old
echoes are moved across the L D, 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
DualBeam P US™ Sonar
(DualBeam PLUS™models only [788ci HD])
Your 788ci HD Fishing System uses a
200/83 kHz DualBeam PLUS™ sonar system with
a wide (60°) area of coverage. DualBeam 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.
DualBeam PLUS™ sonar returns can be blended
together, viewed separately, or compared side-
by-side. DualBeam PLUS™ is ideal for a wide
range of conditions - from shallow to very deep
water in both fresh and salt water. Depth
capability is affected by such factors as boat
speed, wave action, bottom hardness, water
conditions and transducer installation.
How Sonar Works

5How Sonar Works
Down Imaging™ Sonar
(Down Imaging™ models only [788ci HD DI])
Your 788ci HD DI Fishing System 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

6
Xtreme Depth S nar
(Xtreme Depth Series™ models only [788ci HD XD])
Your 788ci HD XD Fishing Syst m uses the XD
transducer to provide extreme depth coverage
with DualBeam PLUS™ technology.
The Xtreme Depth sonar beams can be operated
at two frequencies: 50 kHz (74°) and 200 kHz
(20°). The wide, 50 kHz beam transmits at a low
frequency to provide greater depth coverage, up
to 2500 ft (762 m). The narrow, 200 kHz center
beam transmits at a high frequency to provide
maximum detail at shallower depths.
The DualBeam PLUS™ technology allows you to
view the sonar returns blended together,
separately, or side-by-side (see Sonar Menu
Tab: Beam Select and Views for more
information).
Depth capability is affected by such factors as
boat speed, wave action, bottom hardness,
water conditions and transducer installation.
How Sonar Works

7
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. Depth 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
umminbird®Fishing System, or visit our
Web site at humminbird.com.
How Sonar Works

8
QuadraBeam P US™ Sonar
(optional-purchase QuadraBeam PLUS™
transducer)
QuadraBeam PLUS™ sonar provides an
extremely wide 90° area of coverage.
QuadraBeam PLUS™ starts with two fan-
shaped 35° 455 kHz Side Structure locating
sonar beams to spot fish, bait, and structure
to the left and right of the boat over an area
of the bottom that’s always equal to twice
your depth. For a detailed view below the
boat, QuadraBeam PLUS™ uses DualBeam
PLUS™ technology, with precision 20° and
wide 60° beams. QuadraBeam PLUS™ finds
more fish faster and can even tell you where
to put your bait by showing if fish are to the
left, right, or directly beneath your boat.
N TE: Contact our Customer Resource
Center to determine which accessory
transducers are compatible with your
umminbird®Fishing System, or visit our
Web site at humminbird.com.
90° Total Coverage
Bottom Coverage = 2 x Depth
35° 60° 20° 35°
455 kHz 455 kHz
83 kHz
200 kHz
How Sonar Works