VOR Reference RNAV

The VORVOR —VHF Omnidirectional Range is referenced to Magnetic North at the beacon. This means there is no need for the aircraft to do any calculations before displaying the QDMQDM —Magnetic bearing from an aircraft to a beacon or station/QDRQDR —Magnetic bearing from a beacon or station to an aircraft on the RMIRMI —Radio Magnetic Indicator or HSIHSI —Horizontal Situation Indicator. This is also the reason why you will use variation at the beacon if asked to do calculations with a VORVOR —VHF Omnidirectional Range.

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What datum does the VORVOR —VHF Omnidirectional Range reference to?