Alpha
Indeed it is a non TSO unit.
Saw the same info in the manual. As you say maybe a new PRN number but no satellite PRN outside the 01-32 or 33-64 for WAAS, and 65-99 for GLONASS is shown.
Not important I guess, but would be nice to know.
When I look up the “Accuracy” displayed says 10ft, so I guess not receiving SBAS correction at present.