There seems to be some dispute on whether the iPhone can still get a GPS signal when out of cell tower range, see this archived Apple support thread, for example.
I had a friend out in the woods hunting this weekend, and he said that he couldn't get a location via gps, it was just giving errors.
Does this depend on how the app is coded? Are there specific location-aware mapping apps (like the built-in maps tool) that someone can firm either do or don't work properly with no wireless signal?
Update: I guess its kind of obvious that it entirely depends on how the app is designed. The built-in maps app tries to download map tiles from the internet, and won't be able to do that, so that probably explains his errors.
So my underlying question really is: If I'm going camping, do I need to buy a dedicated "wilderness" GPS like one of these? Or is there an iPhone app that can do the same things when away from a wireless/cell signal?