So I've got about 30 finds under my belt, and set off looking for my first micro. I get to where I should be and nothing is in sight. Generally when I'm looking for a cache, I'll walk away and approach from several different directions to zero in on where I need to be. Same thing for this cache, and it kept leading me to the same spot, which was about 25 feet away from where I needed to be.
Also worth noting - I was at the top of a high hill, had 18 ft. accuracy and plenty of satellites in view. Now I thought that for accuracy, it could be 18ft on any/all sides of you and that multiple approaches would help you figure out more exactly where the site was.
Is it possible for a GPS unit to experience a constant "drift" in one direction or another??