I can't get the simulation to work. I took one of the files from the log/GPS directory, and renamed it to GPSSim.txt and placed it in both the log/GPS directory and Program Files\StreetDeck. There's no "disable GPS" setting in the Settings/Navigation area. Only "disable com port", but seems to be no global disable for Navigation. After disabling com port, i restarted SD and got "GPS Not Configured" on the GPS screen.
Is the simulation supposed to start automatically? Am i missing some settings?