I have had my GPSMap 76Csx for almost a year. When I first used it, the accuracy when caching was phenomenal. In the last couple of months I have noticed the unit compass needle seems to go around in circles and I have trouble locking into the cache location. This has been happening everywhere I go and nearly every time. I have restored the defaults, made sure I do not have too many maps active or stored, reduced the amount of waypoints to under 100. In other words I don't think I am stressing the memory. Can anyone give me a clue as to what may be up with this unit?