I recently purchased a Yaesu FT3D handheld with the intention of making a few contacts through the International Space Station’s digipeater using the built-in Terminal Node Controller. Since the ISS only passes overhead a few times a day for a few minutes at a time, I thought I’d explore some other uses for Automatic Packet Reporting System (APRS). The general use of APRS has always been something of a mystery to me.