Article 111 Flight navigators or navigational equipment required on public transport flights
(1)
In the circumstances specified in paragraph (2) an aircraft registered in the United Kingdom flying on a public transport flight must carry—
(a)
a flight navigator as a member of the flight crew; or
(b)
navigational equipment suitable for the route to be flown.
(2)
The circumstances referred to in paragraph (1) are that on the route or on any diversion from it, being a route or diversion planned before take-off, the aircraft is intended to be more than 500 nautical miles from the point of take-off measured along the route to be flown.
(3)
A flight navigator carried in compliance with paragraph (1) must be carried in addition to any person who is carried in accordance with this Part to perform other duties.