 
The GPSMAP® 178C
Sounder is a new-generation fully integrated chartplotter and powerful
sonar, offering the same brilliant sunlight-readable color LCD,
powerful features, and simple interface as the GPSMAP 172C—all in a
compact, value-priced console that leaves fish nowhere to hide.
It comes standard
with a built-in worldwide marine basemap and accepts MapSource®
BlueChart® offshore marine cartography—featuring detailed depth
contours, inter-tidal zones, wrecks, navaids, and many other points of
interest. For small-water anglers, the GPSMAP 178C Sounder is
compatible with MapSource Recreational Lakes with Fishing Hot
Spots—featuring fishing areas, boat ramps, marinas, and hazards for
hundreds of popular U.S. and Canadian lakes. Pre-programmed data cards
can be easily inserted into the slot on the front of the unit.
The GPSMAP 178C's
sounder is a 500 watt powerhouse featuring dual frequency operation,
bottom lock, automatic gain, sea surface temperature, digital displays
and split screen mode. It also has all the other features you would
expect from Garmin; a 12 channel WAAS receiver for accuracy up to 10
feet, simple operation, audible alarms, celestial tables and much more.
One year Warranty.
Size: 6.3"W x 4.9"H
x 3.7"D.
*The WAAS signal is currently available in the US only in open areas or
on the water.
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WAAS enabled 12 channel GPS receiver for
accuracy of up to 10 feet.