OK, I admit, I'm a gadget guy.... but it sounds so useful to be able to have a moving map of highways, hiking trails and so on. What I really would like to find is a unit that will also have water ways with depths and chart info. Does anyone have any suggestions for a handheld unit? I hear Garmin is the best, but what unit and what other add-ons would I need?<br />Thanks in advance! 