Patent ID: 8390442

Claim:
An apparatus comprising: a first device that receives first wireless signals containing positioning information, and that transmits second wireless signals containing first information, said first information including an identification code uniquely identifying said first device, and said first information including position information based on said positioning information as recently received by said first device; and a second device one of said first and second device being movable relative to the other thereof, said second device transmitting third wireless signals containing second information, said second information including an identification code uniquely identifying said second device; wherein said first and second devices collectively include ranging circuitry that determines an estimate of a distance between said first and second devices, one of said first information and said second information including said estimate as recently determined by said ranging circuitry; and wherein said second device receives said second wireless signals, and transmits fourth wireless signals containing third information, said third information including an identification code of said first device, said identification code of said second device, and position information based on said position information in said first information.