Patent ID: 8805430

Claim:
A system for tracking and communicating between units in a team comprising: a plurality of portable team units, each team unit having: a GPS module; a compass module; a display showing the position of the unit and positions of other team units; a passive sensor; a radio communication module, the module having a transmitter and receiver; a memory component for storing position information, alarms, and text messages; a handheld central unit having: a digital map; a display showing positions of team units on a map; and a transmitter and receiver sending and receiving text messages, position information and alarms; the handheld central unit communicating with other team units, assigning each team unit at least one role, and communicating at least one message containing an instruction selected from the group of: deleting information, turn on, turn off, and change power consumption; and the system configured to use a hop counter or time information to stop propagation of messages.