System use features automotive turn-by-turn driving directions can be attached to windscreen or vent; may offer voice controls; may offer current traffic conditions service handheld hiking, hunting,boating, and other sports often include barometric altimeter, compass, ability to share information with other hikers or geocachers gps watch running, biking, and endurance sports may include a heart rate monitor, ability to programme planned workouts pilot piloting aircraft altimeter, terrain awareness.