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Home  >  Handheld GPS >  Item # HUM4094601 (MFR# 409460-1)
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688ci HD DI 5` Color Screen GPS/Sonar Combo Fishfinder
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Humminbird 688ci HD DI 5" Color Screen GPS/Sonar Combo Fishfinder

Condition: Brand new, USA Warranty
The 688ci HD DI Combo features a High Definition 480H x 640V 5", 256 color display with backlight, DualBeam PLUS sonar and Down Imaging sonar with 4000 watts PTP power output, GPS Chartplotting.

The 688ci HD DI Combo features a High Definition 480H x 640V 5", 256 color display with backlight, DualBeam PLUS sonar and Down Imaging sonar with 4000 watts PTP power output, GPS Chartplotting.  In addition, it includes a card slot for maps or saving waypoints, as well as three programmable preset buttons to save your favorite views.  Maximize your angling experience with the Humminbird 688ci HD DI Combo fishinder GPS system.


Down Imaging Sonar

Down Imaging Sonar -- Get a fish-eye's view of what's happening below your boat. Incredible images are created with High-frequency sound waves

Sometimes, to catch fish, not only do you have to think like one, you've got to see like one. Get a fish-eye's view of what's happening below your boat with Humminbird Down Imaging. These incredible images are created with high frequency sound waves emitted in ultra-thin slices. The sonar returns from these waves produce a "portrait." As you patrol the water, you'll watch fish, reefs, timber, brush, bridge pilings, rocks, and any other structure or cover pop with stunning detail.


SwitchFire Sonar -- Take command of how your sonar returns appear with our Clear and Max Modes.

Building on our legacy of sonar innovation, exclusive Humminbird SwitchFire puts anglers in complete command of how their sonar returns appear. With two unique display modes, you can adjust to your fishing conditions on the fly. Add or remove detail; account for water depth, temperature and turbulence; even experiment with lure presentations-all at the push of a button. SwitchFire adds a whole new dimension to 2D fish-finding. It's one more reason Humminbird is simply, clearly, better.

DualBeam Plus Sonar

Two beams combine for great detail and a wide coverage area. Use the narrow beam for high-accuracy returns and bottom. Use the wide beam when you want a larger search area.

Internal GPS

GPS antenna built into the head unit

Get unparalleled GPS technology out of the box. Many Humminbird fishfinders have our powerful Precision GPS/WAAS receiver built right in and provides fast position fixes accurate within 2.5 meters.

For those models without it, there are several options:
Add the Humminbird Precision GPS/WAAS receiver for permanent GPS capability on your boat.
Use Humminbird?s adapter and the NMEA output on your own handheld GPS unit, or use Humminbird?s InterLink to allow two fishfinders to access one GPS receiver.

Upgradeable Software

Up-gradable Software -- Access software updates to enhance the performance of your Humminbird unit through our My Humminbird section of the site.

Single Card Slot

Single SD Card Slot -- Use for advanced cartography or to save your screenshots, sonar recordings and waypoints.

High Definition Display

Provides bright, crystal-clear images for easy viewing in harsh sunlight.

Tilt and Swivel

Tilt and Swivel Mounts -- Quickly adjust your viewing area angle.

Quick Disconnect

Humminbird's Exclusive Quick Disconnect Mounting System allows you to easily remove your unit for storage at the end of the day and re-install the next morning.


  • Display Size - Diagonal:5"
  • Display Pixel Matrix:480H x 640V
  • Display Type:Color TFT
  • Display Colors Grayscale:256 Colors
  • Sonar Standard:Down Imaging, DualBeam PLUS
  • Standard Sonar Coverage:75 degrees, 45 degrees, 28 degrees & 16 degrees at -10db
  • Standard Sonar Frequency:455/800/200/455 kHz
  • Target Separation:2 1/2"
  • Power Output RMS:500 Watts
  • Power Output Peak to Peak:4000 Watts
  • Depth Capability:350 ft (DI) & 600 ft
  • Temperature:Included
  • Speed:GPS Speed Included
  • Backlight:Yes
  • Mount A Unit Size:6.9"W x 7.5"H x 4.5"D
  • Mount B Unit Size:6.9"W x 5.4"H x 1.25"D
  • Unit Mount Type:Quick Disconnect or Optional In-Dash Mounting Kit
  • Transducer Standard:XNT 9 DI T
  • Transducer Mounting:Transom
  • Power Input:10-20 VDC
  • Power Draw:615 mA
  • GPS Receiver:Included
  • GPS Tracking:Included
  • GPS Chartplotting:Included
  • Waypoints, Routes, Tracks/Points:2,500, 45, 50/20,000
  • Lakemaster:Optional
  • Navionics Gold/HotMaps:Optional
  • Navionics Platinum +:Not Supported
  • Platinum Capable:Not Supported
  • C-Map:Not Supported
  • 360 Imaging:Not Supported
  • iPilotLINK:Not Supported
  • Radar2:Not Supported

NMEA2000:Not Supported
5 Port Expansion Module:Not Supported
WeatherSense:Not Supported
Precision GPS:Included
Heading Sensor GPS:Not Supported
PC Connect:Included
GPS Connecton Link:Optional
AS Interlink:Not Supported
AIS Compatability:Not Supported
SwitchFire Sonar:Included
Screen Snap Shot:Included
Sonar Recording:Included
Upgradable Internal Software:Included
Split Screen Zoom:Included
Split Screen Bottom Lock:Included
3D Chart View:Included
Large Digits View:Included
Wide/Narrow Cone Split Screen:Included
Custom View Selections:Included
Custom Digital Readout:Included
View Preset Keys:Included
Temperature Graph:Not Supported
Temperature Alarm:Included
Freeze Frame:Included
Instant Image Update:Included
Mark Structure on Sonar:Included
Selective Fish ID+:Included
Real Time Sonar:Included
X-Press Menu System:Included
MMC Compartment Available:Yes
MMC #Slots:1


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Humminbird 688ci HD DI 5" Color Screen GPS/Sonar Combo Fishfinder

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