Sorry your Garmins have proved unreliable, Julio. My experience of both the GPS III+ and the V has been excellent. Ours are taken almost exclusively into hot desert dunes, week in week out, and have survived countless hard landings and a fair number of falls. They are standard 'unhardened' units and have never failed.
The GPS is invaluable for marking the location of predetermined meeting points or broken down bikes etc., for navigating through dunes and for retracing 'breadcrumbs' to return the way you came.
They don't replace map reading skills in remote areas but, given the choice, I wouldn't go into the dunes without one.
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