Patent ID: 7292186

Claim:
A method of synchronizing multiple tracking devices in a geo-location receiver system comprising: receiving a first plurality of geo-location signals with a first tracking device; receiving a second plurality of geo-location signals with a second tracking device; enabling said first tracking device alternatively as either a master tracking device or a master-with-mark tracking device; enabling said second tracking device to operate as a slave tracking device; wherein said master or master-with-mark first tracking device generates and transmits a timing signal to said slave second tracking device; wherein said first tracking device in said master-with-mark enablement is configured to receive an external input for synchronization and generates and transmits a timing signal to said slave second tracking device; acquiring said first plurality of geo-location signals and said second plurality of geo-location signals at a substantially simultaneous instant of time; receiving an enable internal input to each said tracking device and receiving an enable external input to each said tracking device; and wherein a tracking device is configured to operate as: a master with a first unique combination of internal and external input conditions; a slave with a second unique combination of internal and external input conditions; and a master-with-mark with a third unique combination of internal and external input conditions.