hi john,
I just travelled through central america and did use my gps. you don't really need it because there are good roadmaps for sale, and the only maps you can get for the gps(I have a garmin) is the worldmap which doesn't have details on street level only the roads.
it did help me leaving towns so I knew I was going in the right direction, and showing me on the gps where I was according to the map.
bye,
Mark
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