Some progress. My device comes up as ttyS0. The /boot/config.txt lines (for me) are: dtparam=spi=on enable_uart=1 I then had to delete reference to console=serial0 from /boot/cmdline.txt Lastly, I had to enable gps using systemctl enable gpsd. Seems to be working now. Thanks very much - getting uart gps up in AstroArch wasn't quite as scary as I feared. LOL.Read More...