pmjasper,
We ownand use exclusively the Ifinder H2O. We are pleased with the unit and would recommend it. We use the recommended RAM mount and have it mounted on the dashboard of our 19' BlueFin. Best advice is get the cigarette lighter power adapter as the 3 AA batteries go pretty fast especially with the use of the light. We use it a lot in the dark early a.m. Also make sure you get an SD memory card (BUY.com sometimes has them for free after rebate - just shipping and some times free shipping too) to save your waypoints. If you ever have a problem and need to send it in for repair Lowrance doesn't transfer waypoints to a replacement unit. We learned this when our earlier hand held fell on the floor (pre-RAM mount days).
Clarke