Say you ran into someone who was really APRS-illiterate. But say this ham attended, for example, a local ham convention over the weekend, and met the fine folks at Byonics. Further say this ham picked up a TinyTrak4, display, GPS receiver, and associated radio cabling - hooked it all up - and is receiving packet info.
What book/manual/text would you recommend to this fictitious ham to learn more about this exciting aspect of amateur radio?
Please let me know ... and I will make sure to read --- er, I mean, I'll be sure to pass on the info to this ham.