You can even do this with simple AM radio stations. Tune an aircraft's ADF to the radio station frequency, get a bearing to the transmitter and then do the same

You can even do this with simple AM radio stations. Tune an aircraft's ADF to the radio station frequency, get a bearing to the transmitter and then do the same with another station. From both bearings you can figure out where you are as long as you know where the transmitters are. It's conceptually similar to what they did here with the Starlink signal but using very different technology.