Hang gliding is an air sport of piloting an aircraft called a hang glider. Modern hang gliders provide the ability to stay airborne for hours and travel hundreds of miles. The pilot uses a body harness to strap into a light-weight unmotorized glider that is foot-launched from a mountain, hill, or tall structure. In areas with flat terrain, a technique called "Aerotowing" is used to get the glider in the air. Most modern gliders have an aluminum alloy frame with a fabric wing. The glide ratio has accurate which allows gliders to fly for extended time periods. Instruments used during flight include a variometer, GPS, and radio. Safety equipment used include a helmet, backup parachute first-aid, ropes, and a knife.
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