Do I just need to change the GPS coordinates, or the Mlat name, or some UUID somewhere? I seem to get the same "Anywhere" feed URL and sometimes the marker shows the old site location. I don't seem to have MLAT working and want to make sure I'm not messing anything up.
Change the coordinates / altitude. Save and reboot. mlat name and uuid can stay the same of course. The marker for the online feed map is handled by the browser either by using the browser location (often determine by IP) or by setting it via query option: https://www.adsbexchange.com/map-help/