This is an APRS iGate using the Raspberry-Pi.
An APRS iGate is an Internet gateway that sends packets from the radio/RF side to the APRS-IS on the Internet (and vice-versa).
The APRS-IS is an Internet based network that connects APRS networks from all around the world and facilitates APRS applications (Realtime Postion reporting of objects overlaid over Google maps.
The hardware:
1. Handheld 2-metreband Transceiver (any 2m transceiver will do).
2. A 2m antenna.
3. The piGate in an enclosure
(a) A Raspberry-Pi
(b) A MicroNEXT MN-WD152B WiF USB Adapter with external antenna
(b) Sony Singstar usb adapter (used as the sound card)
(c) A dual-color LED connected to the GPIO header (to indicate status).
Software
There are various versions of IAPRS software available on the internet to do this task, here are a few links.
https://www.philcrump.co.uk/Raspberry_Pi_APRS_Digipeater
http://home.comcast.net/~wb2osz/Version%200.8/Raspberry-Pi-APRS.pdf
https://github.com/asdil12/pymultimonaprs
http://home.comcast.net/~wb2osz/site/
More Amateur radio Pi projects