When can you use GPS on an approach?

What this means practically is that a pilot may utilize their GPS RNAV system to actually fly along a VOR approach beyond the final approach fix as long as they can “monitor” the VOR (or TACAN or NDB) on a secondary radio and ensure that the GPS is navigating along the appropriate NAVAID course for the approach.



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Many pilots use GPS as an aid to visual flight rules (VFR) navigation. The key word is aid, because VFR means seeing the terrain well enough to confirm your position on a map. Avionics used for VFR do not check for errors in satellite signals, so your GPS position could be bad.

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Ground-based navigation equipment is not required for en route IFR RNAV operations when using GPS WAAS navigation systems. To use GPS for IFRapproaches, you must use GPS avionics that are properly approved and installed, and all approach procedures to be flown must be retrievable from the airborne navigation database.

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