I have the 276. It works great for me. I have a small disc in my truck as well as my boat That i can clip it in to. Its nice to use it in the car and then put it in the boat. I alsoon can download maps on it when i go on my other vacations (Ireland, Vegas ect.)
The mapping is great when your in a strange place. The screen lights up well and has great definition.
The almost 600.00 was a little steep but i get ALOT of use out of it........

COHO
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COHOFSHR.... Mine is not to wonder why mine is just to fish and die!!!!!