You will be very content and safe if you buy this GPS
23 November 2013
Summary: I had one on my 20ft Key West which I operated in the Lemon Bay area of the inland waterway on the SW Florida coast. This is a very shallow area and it's vital to stay within the deeper water. The included mapping and graphing was colored and detailed in a way that made it easy to stay in safe water. It took some time initially to learn my way around this device, but well worth the efort.