By no means an expert, but I've use a Garmin eTrex 20 Global GPS. Here in Europe, most trails are clearly marked, but there are so many of them, that even a map won't keep you (me) from getting turned around. Sometimes the downloaded maps, and the ones they have posted on trails contradict each other. With my GPS, it's been hassle free, but still carry maps just in case. One time in particular we saw a guy studying a map posted, and it looked like a tangle, of a tangle of spider webs, and had no marking of where he was standing. Glad we had our GPS, and helped him, and ourselves out of that mess.