What navigation aspects were you hoping to replicate that you do not believe are possible in MSFS? I ask because at this moment there are the following freeware capabilities outside of what’s already given in the sim at least for MSFS2020:
Celestial, Solar, Lunar Navigation: https://flightsim.to/file/17738/celnav-for-msfs-celestial-navigation-sextant
Radio Ranges: https://flightsim.to/file/21201/radio-range-navigation