Humminbird 688ci HD Combo

12.7 cm (5 ") TFT 480 x 640, 200/ 83 kHz, DualBeam PLUS, 500 W RMS, 457 m The 688ci HD Combo features a High Definition 480H x 640V 5" 256 color display with backlight, DualBeam PLUS 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 Combo fishfinder GPS system.

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

<b>DualBeam Plus Sonar</b>
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.

<b>Internal GPS</b>
GPS antenna built into the head unit

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

<b>High Definition Display</b>
Provides bright, crystal-clear images for easy viewing in harsh sunlight.

<b>Unimap Cartography</b>
The Humminbird UniMap is a built-in map covering the contiguous US coastline, inland lakes and rivers at 30 meters per pixel resolution.

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

<b>Quick Disconnect</b>
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.

<b>Precision GPS</b>