Join Date: Oct 2009
Location: Northern Nevada
GPS doesn't depend on having a cell phone signal. Lots of places I ride (hike, &c) don't have cell service, but GPS works ok. It just needs sight of a good slice of sky - trees are ok, but canyons may block too many of the satellites for a usable fix. (IIRC you need at least 3, and will get a position faster if you can see more.)
Now if your GPS is built into a smart phone, it may not work if there's no cell signal, but that is a design flaw in the phone, not anything inherent in the system. Good thing to check it before you head out too far.
PS: Just one thing to be aware of is that the maps on a GPS (or on-line) don't always reflect the reality of what's on the ground. Around here a lot of the dirt roads/trails aren't on maps, while other roads shown on the maps don't actually exist, or are several dozen yards from where the map says they should be.
Last edited by jamesqf; 12-25-2012 at 11:46 PM.