Patent ID: 7233795

Claim:
A communication system for communication between a first communications unit and at least one other communications unit, comprising: first communications unit, comprising: radio-telephone means for sending and receiving messages by radio including means for initiating, maintaining and terminating said messages; means for receiving encoded earth locations of itself in at least two dimensions from a Position Locating Satellite; means for encodingly defining a selectable geographic zone having boundaries encoded in at least two dimensions to seek connection with a targeted communications unit; means for initiating a radio call in said selected geographic zone, said radio call including a code of said selected zone; and second communications unit, comprising: radio-telephone means for sending and receiving messages by radio including means for initiating, maintaining and terminating said messages; means for receiving encoded earth locations of itself in at least two dimensions from a Position Locating Satellite; means for encodingly defining a selectable geographic zone having boundaries encoded in at least two dimensions to seek connection with a targeted communications unit; means for comparing said geographic zone selected by said first communications unit with said encoded earth location of itself to determine agreement therewith, and means for responding to said radio call when said encoded earth location of itself is encompassed by said selected geographic zone.