GM1 NCO.IDE.A.195(a) Navigation equipment

CAA ORS9 Decision No. 47

Text in magenta in force from 30 October 2025

NAVIGATION EQUIPMENT — SCOPE OF RNAV SUBSTITUTION

1. Applications of RNAV substitution include use to:

   1. determine aircraft position relative to or distance from a VOR, marker, DME fix or a named fix defined by a VOR radial or NDB bearing;

   2. navigate to or from a VOR, or NDB, except as lateral guidance in the FAS of an IAP;

   3. hold over a VOR, NDB, or DME fix;

   4. fly an arc based upon DME; or

   5. fly an overlay of a conventional departure, arrival, approach or route except as lateral guidance in the FAS of an IAP.

2. RNAV substitution for ADF, marker and VOR may be used where airborne and/or ground-based equipment is not available.

3. RNAV substitution for DME may be used where the ground-based DME transponder is unserviceable or the airborne DME transceiver is found to be unserviceable in flight. Caution must be exercised by the pilot-in-command when calculating and using GNSS distances to the active waypoint as reference points are often different.