I have a GPS but have hardly used it up until this point, I always find it much quicker to ask for directions, especially in places like Bolivia.
If you can upload some offline-mode google maps onto it (not sure if this is possible for you, I use them on my cell phone which works a treat) then all of the roads are there in detail.
Definitely learn to speak directions in Spanish if you haven't already, it will help you heaps!
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