Um, what? A satellite-based GPS? As opposed to a GPS that doesn't use satellites? All GPSes are satellite-based.
Google Maps plus some satellite images is usually pretty good, and of course nothing beats being prepared. (Bring MUCH more water and sun protection than you think you need!)
Google Maps plus some satellite images is usually pretty good, and of course nothing beats being prepared. (Bring MUCH more water and sun protection than you think you need!)