An object locator device is disclosed for use in conjunction with both a GPS 
satellite system and a two-way communication 
satellite. The object locating 
system includes a mobile unit physically connected to the object to be located. The mobile unit includes a 
satellite communication 
transceiver capable of receiving and transmitting encoded signals. A decoder is associated with the satellite communication 
transceiver for decoding a unique 
signal associated with that mobile unit and for generating an activation 
signal upon 
receipt of the unique 
signal. The mobile unit further includes a 
GPS receiver which is activated in response to the 
receipt of the unique signal so that the 
GPS receiver generates a position signal representative of the position of the mobile unit. The output signal from the 
GPS receiver is connected as an input signal to the satellite communication 
transceiver such that the satellite communication transceiver transmits the.position signal to a 
base station on the communication satellite. The 
base station physically separated from the 
remote unit is operable to both transmit the unique signal to the communication satellite in order to activate the mobile unit as well as for receiving the position signal from the communication satellite following activation. The 
base station creates a display representative of the location of the mobile unit. Preferably, this display signal is transmitted via a 
telephone line and modem to a computer which generates the display on a 
computer monitor. 
Energy conservation algorithms including periodic activation of the satellite communication transceiver as well as activation of the satellite communication transceiver only when the position of the mobile unit has changed more than a threshold amount between periodic signals is disclosed.