A good number of years ago I was looking for a good slideset to do an Intruction to APRS in one of the local clubs. I went looking and found a slideset by John Beadles, N5OOM, emailed him, and got his permission to re-use it.

A while ago, John Langner, WB2OSZ, contacted me to see if I would revise them a bit more. Hopefully the slides will save someone some time getting up to speed on APRS