US Patent 7460011 Communicating direction information

Communicating direction information includes determining direction information with respect to a first frame of reference, and transmitting from an originating entity to one or more receiving entities intermediate information based at least in part on the direction information. For each of at least some of the receiving entities, information based at least in part on the intermediate information and a relationship between the first frame of reference and a second frame of reference associated with the respective receiving entity is presented.