Summary: This unit is a great up grade from Garmin 172c. Don't depend on the installed base map for any navigation on the water. It is useless. So you need to be prepared to spend $120 to $300 + to purchase Bluechart G2 Vision SD micro chip in order to get useful charts.
This is a great GPS. It is very accurate even here in ...
Joseph Strongheart, Amazon
24 July 2014
Summary: This is a great GPS. It is very accurate even here in remote alaska. Minor downside is that it has a world base map that is not clear or good. Had I know the base map was this bad, I would have bought an updated map with it. Otherwise, really good to have.