I bought the 787c2i with internal gps reciever. My only gripe would be that the gps is slow to aquire satelites, but once it does I've never had it lose them. I've had lot's of Humminbird sonar units, the only reason I got this one is that the old one started turning its self off all the time, and I convinced my wife I needed gps for safety reasons. :laugh:You never know when the fog will roll in at the mouth of the Lewis, and you may have to rely on your electronics to make it home in time for dinner.