I have a 20 foot Alumaweld Super V LT and I would like to get a GPS for the few times I go out for halibut (maybe 6 per year). I already have a garmin fish finder / depth sounder so I don't want a combo unit. Should I just buy a hand held unit that I can use for hiking /hunting as well or a non portable model? I think for halibt I don't need maps (just x marks the spot) but for hiking that would be nice. Advice and recommendations please and include brand and model. Also, what features should I be looking for. Thanks folks!