We use a two-pronged approach with the n810 and an eXplorist 500. GPXview has much more information than is stored in our gps unit. I've made this ridonkulous gauntlet affair to hold the n810 on my arm and my partner in crime uses the GPS. The n810 is best to get us into the area, but once there, having read the logs and the hint, the "real" gps is used to get us right to the cache.

We've found a few with the n810 alone, but it's not accurate enough in rocky terrain or forest.