How APRS works.

APRS is Automatic Packet Reporting System. Which is combination use between GPS, TNC(Terminal Node Controller), PC(Optional) and Radio. Picture below is the example of the basic APRS setup usually at base station.

For Mobile station things thats need to keep the APRS work is GPS receiver with the NMEA 0183 system, and tracker which to convert the NMEA data to packet data and finally the radio used to send out the packet data via RF link to the base station with APRS system running for realtime tracking. Picture below shows the basic setup of the APRS network Diagram.

SSID used in the APRS system is as below listed,

-0 Home Station, Home Station running IGate.

-1 Digipeater, Home Station running a Fill-In Digi, Wx Digipeater

-2 Digipeater [#2 or] on 70CM

-3 Digipeater [#3]

-4 HF to VHF Gateway

-5 IGate (Not home station)

-6 SatGates & Special function Station.

-7 Kenwood D7 HH

-8 Secondary Mobile station.

-9 Primary Mobile station.

-12 Portable Units such as Laptops etc.

-14 Trucks

-15 Mobile HF station.

These SSID is to carefully picture out what station that is online. For example mobile station, SSID for the mobile station will be callsign -9.

Frequency use in APRS is 144.390MHz.