GPS units offer great promise... if you can figure out how to use them. Most people experience a pack's full of frustrationin trying to learn these complicated devices. GPS Made Easy, 5th edition is the instruction manual that was missing with your device. In addition to the basics, it includes navigation in diffucult weather (such as a whiteout), intergrating hand-held GPS tools and data with computer programs (such as TOPO maps), and an explanation of systems being used in other countries.
GPS Made Easy, 5th Edition is written so anyone can learn to use this technology, with lots of easy-to-follow examples.