When you say, when you're close to shore, it indicates you're on land, now if you were at the other side of the lake and on shore, would it put you in the water? I know on my prehistoric Lowrance, it has several options of correction factors if the map or lake and GPS don't line up so you can manually correct it. As for the unit indicating movement when you're standing still(that's a PQ thing, you guys always think you're going faster)although honestly, I think the unit should indicate zero ground speed. I know mine will give fluctuating very low speed readings if I'm walking really slow or just slowly drifting with the boat. If Humminbuzzard knows about the problem, then it's their problem. Unless they advertized it as a crappy product without an external antenna, then they should at least "give" you the antenna. Who pays for repairs if you run into a rockpile, I'm sure it's not in their parameters of things to do.