Patent ID: 7446702

Claim:
A position data exchange system, comprising: a first cell phone, comprising: a global positioning system (GPS) receiver deriving coordinates of the first cell phone; an electronic map and a first electronic schedule, each of which is stored in the first cell phone, the first electronic schedule scheduling when to transmit the coordinates; a communication unit transmitting the coordinates; and a second cell phone receiving the coordinates transmitted from the first cell phone, and displaying corresponding information of the coordinates of the first cell phone; wherein: the second cell phone comprises a second electronic schedule scheduling when to transmit a request to the first cell phone; and the first cell phone transmitting the coordinates to the second cell phone when receiving the request from the second cell phone, or when a current position of the first cell phone satisfies a position-based condition, or when the first electronic schedule is due; and wherein the first cell phone extracts a map image corresponding to the coordinates from the electronic map, and transmits the map image to the second cell phone.