For about $150 anyone can access the United States' multi-billion dollar GPS program. Using GPS Units: A Practical Guide for Hikers, Bikers, Paddlers, and Climbers shows readers how to plug in and enhance most any outdoor experience. Whether a hiker on a weekend trip through the Great Smokies, a backpacker cruising the Continental Divide Trail, a mountain biker kicking up dust in Moab, a paddler running the Lewis and Clark bicentennial route, or a...