Wilderness Navigation: Finding Your Way Using Map, Compass, Altimeter & GPS, 3rd Edition (Mountaineers Outdoor Basics): Burns, Bob, Burns, Mike: 9781594859458: Amazon.com: Books
Amazon.com: goTele GPS Tracker, No Monthly Fee No Network Required Mini Portable Off-Grid Real Time GPS Tracking Device for Outdoor Hiking, Hunting, Kids and Pets Tracker (2 Pack) : Electronics