Vor’s are devises that send out a signal in all the 360 degrees. The plane picks up 1 (selected by the ‘OBS knob’) of that 360 signals and uses it to fly in a certain direction. All modern commercial planes use Vor to navigate, but you can’t use them in infinite flight. Vor’s are all ready in the game, but only serve as a route leg. It would be necessary to have a OBS/course (737) knob and a possibility to tune the frequention of the Vor’s in IF. Maybe also a VOR/LOC, but it isn’t really that important.
Why is it necessary?
-It is widely used IRL.
-It makes the use of charts a possibility, witch:
-Adds realism to IF