Improved throughout for clarity, with chapter objectives presented at the beginning of each chapter and summaries, "skills check" mini-quizzes, and practice problems listed at the end
Updated descriptions of the most current maps, compasses, altimeters, and Global Positioning System (GPS) receivers
Updated declination maps for the United States and the world (declination changes over time and compasses must be adjusted for a specific location to provide correct readings)
Much-expanded GPS chapter, including interfacing the GPS receiver with the home computer, maximizing battery life, and using the GPS function on a “smart” phones (along with a description of their limitations)
Additional information on non-GPS navigational techniques
Recommended websites, apps, and other sources of useful navigational information