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Poor for navigation
GARMIN COLORADO 400C HANDHELD GPS WITH BLUECHART G2 LOADED

This unit has nice charts but does not dampen the heading and boat direction. The result is that with each move of the boat the heading shifts and thus the boat almost spins on the screen. If you don't know which direction you are heading what use is the instrument? David

better than sliced bread
Just throw out consideration of any others, the screen redraw is as fast as any commercial unit I have seen (in fact it's better than the system on the Boston Harbour Ferry I drive). I bought it for my boat bag for the east coast, ended up in Los Angelis for a race around Catalina Island, marked the exact slip in Marina Del Rey I left from and found it on my return. Tide and current charts at your fingertips, played with it on the plane back (watched every marina in the country go by at 540kts) identified all the rivers enroute, bought the street maps for north america (~100 or so dollars) loaded all of north america onto a 2gig card and used it in Cali and Boston with out having to touch a thing. This 400c is the same price as the cheaper units after you buy maps for them and just blows everything else away performance wise. Just better than sliced bread. Plus its rugged as heck.