One thing I think I've finally figured out, you get MUCH better readings if you have FRESH batteries. I've been fussing lately about how far off my GPSr was, even with a 50% power level remaining. I decided to put in new batteries today, and wow! what a difference!

Bottom line, if you're ESTABLISHING a cache, make sure you've got fresh batteries in your GPSr, so that the accuracy is as good as your unit can get.