0ur opinion: :The GPSMAP 172C fixed-mount chartplotter offers brilliant sunlight-readable color LCD, robust features, and a user-friendly interface - in a compact, value-priced console.lt 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 172C 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.For added flexibility, mariners can upgrade the GPSMAP 172C to a full-fledged combination chartplotter/sounder at any time by adding a Garmin GSD 20 'black box' sonar and transducer.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* 90% really like, but.... ...
GPS great....manual very explicit......easy to understand and follow.
However, Page vi of owners manual includes an optional "US A/C, PC Adapter", which is not available.
Had to purchase an additional "USB Data Card Programmer" to transfer MapSource data to the required data card.
Buyer's feedback: 
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Best value
I liked this GPS so much that I've purchased two in the last six months. It has a lot of features and is easy to use. This model also has the largest screen for the price that I could find. The only drawback is that it doesn't directly interface with a PC. The Garmin Blue Charts are good but not cheap. All in all I think it's a "best value" type unit.
Buyer's feedback: 
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* Great Product.....Great Price! ...
I looked at a number of ChartPlotters before I decided to purchase the Garmin 172C from . I was very happy with the price, especially after hunting around for the best price around. Amazon beat everyone else hands down. And a "New Product" at that.
I am very happy with the ease of installation, and the internal antenna feature. I have not yet used the fish finding feature, however I plan to purchase the transcom and other associated pieces to use this feature as well.
I say, "Buy this product" if you are looking for a unit with it's sort of features (portable, internal antenna, etc). I'm glad that I did.