sentences:  In-air tracking is provided by radars and various other in-air tracking systems such as LATR, the Hyperbolic In-Air Tracking System (HITS), and Differential GPS (DGPS).These in-air systems cover the AUTEC Weapons Range up to a distance of from Site 1 and a height of 70,000 feet (21,000 m).Surveillance radars operate to support air and surface safety.