I traversed the White Mountains in Crete a few years ago. In the hut on day one we met a German who showed off his GPS with great enthusiasm. He had digitised the route into the device back home before the trip using the best map he could find. Unfortunately the maps of Crete are rather more schematic than our OS maps and the waypoints were hundreds of metres out of place on the ground due to the inaccuracy of the map. He followed the GPS religiously instead of the map and had a real epic in the maquis, ending up in the wrong valley and having to return to the hut. The hut warden said he was the only one ever to get so completely lost.

We met him after the event, and he was still in love with his GPS. I would have binned it.