The Air Navigation Order 1995

Scale F

Radio and radio navigation equipment capable of enabling the aircraft to be navigated along the intended route including either:

(a) (i) automatic direction finding equipment;

(ii) distance measuring equipment; and

(iii) VHF omni-range equipment; or

(b) Equipment, including the Decca Flight Log, which will enable the aircraft to be navigated by means of signals received from radio navigation land stations forming part of the Decca radio navigation system and which provides the pilot with a visual indication of the aircraft’s position relative to the intended route.