I'm interested in getting an N810 for both net-tablet use and also as a GPS... and while I've seen lots of reviews of using it as a "calculate a driving route" style GPS, I'm more interested in using it as a hiking-and-outdoors GPS (specifically, for recording locations of cave entrances) -- generally in out-of-the-way rural areas that are almost certainly not going to have WiFi or WiMax coverage, thus no net connectivity.

And as an added bonus, the locations I might want to record are often in somewhat canyon-y areas, thus with more limited satellite visibility. (Newer SirfStarIII based systems generally do OK in these areas, but older chipsets often have problems getting fixes.)

I haven't seen many people talking about using it in this way -- anyone had any experience using it like this? Pros or Cons? Would I be better off buying a dedicated GPS unit for this?