Automatic Position Reporting System
APRSTM is an integration of hardware and software that allows you to automatically track moving objects (such as vehicles, people, and weather) in real time using maps displayed on your computer monitor.
Operation of APRS requires :
Unlike other packet radio applications ( PBBS's, nodes and DX clusters, etc ), APRS uses an UNCONNECTED protocol to transmit your exact position, a symbol denoting the type of station you're running and a brief comment about it. It also used as direct keyboard-to-keyboard "chatting," has direction-finding capabilities, can be interlinked via the internet, used to view weather ( and earthquake ) transmitted from the weather stations, and much more.
Since this is an UNCONNECTED protocol, on-air packets can be kept to a minimum. With APRS you only send ONE packet to convey your information. If it's not received on the first transmission, APRS retransmits this information using a decaying time delay. This makes more efficient use of the frequency.
For further information, please visit Jeff Brenton, KA9VNV, APRS website.
"APRS" is a registered trademark of Bob Bruninga, WB4APR.