PacketRadio

http://ewcop.com/index.php?option=com_content&task=view&id=12&Itemid=49

Build a data modem on 200Mhz to send a low bitrate signal with GPS coordinates. Can even use radio ham channels.

Other Accessories

* Optional Transponder (tag) - vehicle identification range approx 350m for ground crew recovery. Recommended for cash transit and high risk vehicles, which require speedy recoveries in high density areas. * Optional RF Beacon offers vehicle identification. Range up to 200km for aircraft to vehicle recoveries. Recommended for long haul high risk vehicles travelling into very remote areas.