There is no way to get directional information to a VOR; instruments like an RMI have to fake it by comparing the current radial (which can already be very different from the magnetic [or in the north, true] bearing from the station).
Without looking up my notes I would guess that the information would be processed by the Nav receiver and feed to the VOR needles.
Right, but the system will also need input from a directional gyro (possibly slaved) to know which way to make the needle point. My point was that it's not like the ADF which (more or less) points towards the transmitter; it's more a guess at where the transmitter might be based on the difference between the inverse of the current radial and the indicated heading. If the VOR radials are 4 degrees off magnetic (which happens fairly often), and the VOR indicator is another 4 degrees off, you would could end up with the needle pointing 8 degrees off the actual bearing to the VOR transmitter.
I don't disagree that the HSI and RMI are good instruments to model, but I don't think that Curt's idea of giving the actual bearing to the VOR station is the right way to do it. We should be able to model the RMI VOR pointer using only the (indicated) heading and the current VOR radial, just like the real instrument does.
All the best,
David
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