GPS Simplified for the Outdoor Adventures This pack-sized book is a guide to practical field use of the Global Positioning System for anyone whose play or work takes them to remote areas. Written in simple language, with each new term explained as it's used, this book is a wealth of useful backcountry navigation advice for beginners and experts alike. Bruce Grubbs is an avid hiker, mountain biker, and cross-country skier who has been exploring the American desert for over 30 years. An outdoor writer and photographer, he's written seven other FalconGuides. He lives in Flagstaff, Arizona.