APRS

Lots of info

http://info.aprs.net/

Some notes on available hardware

I have a Kenwood TH-D74A handheld with built in GPS and APRS

I have a Kenwood TM-D710A mobile and I am setting it up to support APRS with a GPS receiver

Argent Data Systems

Products for amateur radio including APRS applications

http://www.argentdata.com/

2m Transmitter MX146 from SRB -- This is a 500 mW transmitter, $70

OpenTracker+ is open source / open hardware and uses a Motorola MCU.

Tracker2

These are controllers, connects a data stream (eg weather or gps) to a Kantronics TNC.

They now have a Tracker2 with a 5 watt 2m radio now. T2-301 $229

Byonics

http://www.byonics.com/

Maker of TinyTrak controllers and MicroTrak transmitters

Purchased way back in 20 Aug 2010 and tossed into a "future projects" box. I got a TinyTrak4 controller kit and a MicroTrak MT8000 8 watt transmitter.

2013-Sep-03 I am thinking of using the TinyTrak+MT8000 with a Garmin GPSmap as the NMEA data source, with the Garmin Power/NMEA cable. Then I can carry it on a bicycle.