As far as cell coverage,I just meant that I can't use the popular iphone gps app,cause it won't work out there,and that i'll need a unit capable of picking up signals from multiple satellites.I was told some models can do this,can't remember which ones though.so far my best option will be one that will let me download trail gps coordinates,trying to find topo sites for canada is proving difficult.There's acouple forums that I can download trail info.