Listening watch
For the entire period from which you taxi a VHF radio-equipped aircraft onto the aerodrome’s manoeuvring area (see page 1.25) until the aircraft is brought to a complete stop at the point of termination of the flight, you must maintain a ‘listening watch’ using the aircraft’s VHF radio (CAR 243).
Furthermore, whenever you are flying a VHF radio-equipped aircraft in the vicinity of a non-controlled aerodrome, you must make a broadcast whenever it is reasonably necessary to avoid a collision or the risk of a collision with another aircraft (CAR 166C).