Todd Harrison, member of the Superstition Amateur Radio Club (SARC), posted this video by Steve Bowen: APRS and GPS networking, operations and theory
This presentation does not cover how to setup and use Automatic Packet Reporting System (APRS) but does get into its origins, limits, functionality and usage.
baofengUV-3R FTW. Small, firmware is hackable, it should be possible to make an APRS transceiver out of it. And connect the GPS via the serial port available on the audio jacks.