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The truth about RMI Needles.

You may remember my issues with the VOR needle not working.   Well, thanks to the members of the CIX VFR Club,  I’ve been corrected.

The gauge and radio panels

The problem I has was that the gauge when in VOR tracking mode pointed in a seemingly random direction.  Where as the ADF pointed at the NDB station as expected.  It was pointed out to me that the RMI when tracking VOR’s points at the direction the aircraft needs to fly to fly towards the VOR.

To summarise :

The needle when set to ADF mode points towards the NDB relative to the aircraft.

The needle when set to VOR mode points towards the VOR relative to magnetic north.

Kinda embarrassing, but it’s illogical.  Depending on VOR or NDB tracking the needle acts in different ways.

Ohh, well we live and learn 🙂