I've never had any issues with GPS. The units I have work well for me.

That said, I alway carry a map and compass with me in the backcountry and I know how to use them.

I teach backcountry navigation classes in the Pacific Northwest.

I try to impress on my students that land navigation skills are on a par with and just as important as marksmanship, tracking and physical condidtioning.

Blake
www.outdoorquest.biz
www.outdoorquest.blogspot.com