I am not using a navigational instrument on my boat very often and am attracted by the portability and possible dual use of this Palm based unit. It seems to be an exellent vehicle GPS system, would it be sensible to make it a boat cockpit display, especially with a laptop on the captain's desk. I hope that there are some sailors in this community who are using this unit and can advise me about the usability with nautical charts. I am aware that this PDA/GPS does not support the NIMEA protocol.Thanks,Richard