We had some property monuments we could not locate on our remote ranch in Alaska because of thick vegetation regrowth and the demise of old original bearing trees over 40 plus years of wind and weather. We converted survey information to GPS coordinates (no easy feat in itself) and came within 15 feet of the illusive survey monuments. Previously we had spent weeks trying to locate some of the monuments but to no avail.
Old Vaquero about GPS & Maps: Location Tracker, v2.2