After using my CO 400t for the last two weeks I've been very pleased with the GPSr itself. I've seen no issues with grabbing and holding lock, EPE has always been sub 20', normally in the teens with a minimum of 5-6 satellites at good strength. I've been walking the same trail over and over since getting the CO and the track logs for each of these are right on top of each other (within 10-20'). So far so good, until this morning.   On the walk out everything looked fine. I went off onto s