Thanks John, Confused isn't the word for it remember the movie Carrie well her head just spun around mine just exploded. I checked 520s (discontinued) replaced by Hds5 even ebay are in the 700 range the more I researce the less I know. I have HB565 b&w and an older gps unit (HB) that I've never got to work right but for speed and direction.As far as mapping goes winn,newfound,squam winersquam,and the ct.lakes are important but also something I can add to later if a trip yo the great lakes pops up along with a new boat.Sorry to drag on and on but I don't want to make 5,6,700 dollar mistake.Thanks for you imput BARRY