I want a GPS for use in my Car, for Hiking, for OFFROAD driving, and for MARINE use. Will SP-2610 do the job for me? No! We do not recommend the SP-2610 for any of your proposed applications EXCEPT for Car Navigation ON ROADS which SP-2610 is optimized for and where its performance is quite good. For Offroad driving, the unit provides no guidance directions and it only operates as an electronic map showing your position on the map. The same is true for Hiking and for Marine use. For Hiking, the story is even worse since the 2610 has no internal battery. In general there is no GPS which is optimized for all your proposed applications, but the Garmin GPS-V is about the best compromise I know of in a stand alone GPS unit.