Here is my current problem. I am trying to get the NMEA GPS Data that my 5100 should be able to output and use it for APRS. I have a TNC-Pi working on the bench, but I want to put GPS in to it. What settings do I need to enable to get GPS out from the Data Port. I have a FTDI chipset 2.5mm to USB cable. What program can I run on my windows laptop to confirm that I am getting this data out of my radio before I try to interface with Xastir on the Pi. Has anyone else successfully used the 5100 data for APRS purposes?