Patent ID: 7330150
Filing Date: 2008-02-12
Classification: G01S

Abstract:
1. A system in which a plurality of portable navigation units wirelessly communicate with one another, the system comprising: a first portable navigation unit having a navigation receiver for receiving signals from a plurality of sources, a processor coupled with the navigation receiver for calculating a location of the first unit as a function of the received signals, a radio transmitter coupled with the processor for transmitting a radio signal including information indicative of the location of the first unit, a radio receiver, a microphone, a speaker, and a display; and a second portable navigation unit having a navigation receiver for receiving signals from a plurality of sources, a processor coupled with the navigation receiver for calculating a location of the second unit as a function of the received signals, a radio receiver coupled with the processor for receiving the radio signal from the first unit, a display coupled with the processor, a microphone and a speaker for permitting voice communications with the first unit, and a radio transmitter coupled with the processor for transmitting a radio signal including information indicative of the location of the second unit; wherein the processor of the second unit is operable to transmit to the first unit location information indicative of a previous location of the second unit.