Setting-up an APRS iGate and Digipeater in Linux

As a long time Amateur Radio Operator (callsign: KB8MON), I recently explored more into APRS, the Automatic Packet Reporting System.  This interest was driven by another interest in High Altitude Balloons (HAB), and how they might be tracked.  I live in downtown Detroit, and found that there is a vacuum here of what are called “APRS digipeaters” [...]