Mt Whitney Zone Forums General Discussion Hiking GPS with Preloaded Trail Map

Although I agree with the above speakers, I want to point to the fact that navigation with GPS takes less time than navigation with a map and a compass.
Yes, the batteries of your GPS can die. And my first GPS itself has actually died on the summit of Mt. Marcy in a fog. On the other hand you can lose a map and a compass (I actually have managed to lose a map once but never lost a compass so far).

So I typically carry a GPS and a map and a compass and an altimeter and sometimes a description/photos of a trail.

Actually GPS is useful to keep track of your progress and also can bring you back to trail when you lost a trail. People (especially first timers) do lose this trail.