If you want some old time navigation there’s this mod https://flightsim.to/file/21201/radio-range-navigation which is actually being built into the upcoming Boeing 247D by Wing42: [Released] Wing42 Boeing 247D and here’s a wiki link about the system Low-frequency radio range - Wikipedia
And by the same modder there’s also this https://flightsim.to/file/17738/celnav-for-msfs-celestial-navigation-sextant and also a driftmeter https://flightsim.to/file/19402/simple-driftmeter-for-msfs