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The Humminbird 688 ci HD DI offers anglers a combination of down imaging and GPS. The 688 has a 640 x 480, five inch display with 256 colors and a backlight. Note that this display has lower resolution than the one found in the older 5 inch models that had 640 x 640 resolution. As the result the output is not as crisp and clear. Nevertheless, the new 688 is an attractive offering mainly due to its moderate pricing.
The 688 doesn’t have much new technology. Humminbird users are very familiar with Down Imaging and SwitchFire which provides complete control of the appearance of their sonar returns. The output can be adjusted on the fly with the two unique display modes. The presentation of lures can be experimented with, turbulence and temperature can be accounted for and detail can be removed or added all by simply pushing a button. In the Clear Mode, you can reduce the visibility of undesired clutter, such as suspended particles causing interference. You will be able to see only what you want to see. For a clearer image of structure and fish, you can filter out noise in rough conditions. In the Max Mode you will be able to monitor their lures easily by watching the jigging action of artificial lures or live bait action to make sure that the bait is presenting optimally. Even in water currents and thermoclines, you will be able to see fish, structure, and cover. The max mode provides incredible detail.
DualBeam PLUS is another legacy feature offered by Humminbird 688. DualBeam Plus gives you 2 sonar beams – center beam that is narrowly focused and surrounded by a second 60 degree beam that will expand the coverage area. In order to show structure, the first beam will be focused on the bottom. The second beam is looking for fish. Although when working together the angler will have a clearer image of what is going on beneath their boat, the beams can be used independently. The precise, 20 degree beam provides high accuracy, while the wider 60 degree beam provides ample search area. The beams can be blended together for a complete picture or viewed side by side or separately.
Other user-friendly technologies included in the Humminbird 688ci HD DI are: customizable display colors and background colors, a temperature alarm, and a Triplog. The Triplog allows the user to collect information and statistics on their fishing trip, such as duration, water temperature and water clarity. Like other Humminbird products, the 688ci is waterproof, comes with a built-in backlight for use in direct sunlight. The device’s split screen enables the user to either quickly zoom in for a closer look. You can save your favorite views with three preset buttons that are programmable.
The GPS comes preloaded with Humminbird UniMap and supports Navionics Gold and HotMaps upgrades. There is a single SD card slot for saving waypoints and maps. GPS also provides accurate speed. The included transducer – XNT-9-DI-T – is the same as the one used on the old Humminbird DI models. It has 500 Watts RMS, 4000 Watts PTP power output. The 688 comes with a mount that quickly connects and disconnects, the display unit can also be in-dash mounted.
|Lowrance Elite-5 HDI||Garmin echoMap 50dv||Humminbird 688ci HD DI|
|Screen Size||5 in||5 in||5 in|
|Screen Resolution||480 x 480 pixels||640 x 480 pixels||640 x 480 pixels|
|Display Type||256 Color TFT||Color VGA||256 Color TFT|
|Imaging||2D and Down Imaging||2D and Down Imaging||2D and Down Imaging|
|Transducer Type||Transom Mount/Trolling Motor||Transom Mount/Trolling Motor||Transom Mount/Trolling Motor|
|Transmit Power||250W RMS, 30,000W Peak to Peak||500W RMS|
|500W RMS, 4000W Peak to Peak|
|Sonar Frequency||(50/200 kHz or 83/200 kHz) 2D|
455/800 kHz Down Scan
|50/77/200 kHz, DownVu||200/455 kHz 2D
455/800 kHz Down Imaging
|Maximum Depth||1000 ft/2500 ft 2D|
300 ft Down Scan
|2,300 ft @ 77 kHz freshwater|
1,100 ft @ 77 kHz saltwater
|600 ft 2D
350 ft Down Imaging
|GPS Antenna Type||Internal||Internal||Internal|