The new edition of this easy-to-use guide, updated by the experienced walker and outdoor navigation expert Clive Thomas, uses non-technical language to introduce you to choosing and using a GPS receiver to enhance leisure walking and to participate in geocaching. This fully updated edition uses the new Garmin eTrex 10 model to explain the basic principles and step-by-step functionality of using GPS or walking and geocaching. It includes everything you need to know, with expert tips, reliable advice, valuable information and practical guidance. The guide includes: how a GPS functions; how to navigate using a GPS; its practical uses when walking; and an extended chapter on how to geocache with your GPS. This is the perfect introduction to GPS, digital maps and geocaching.