91A   Directions of harbour master acting as marine pilot

(1)  Nothing prevents a harbour master who is acting as a marine pilot for a vessel from giving a direction under this Part in relation to the vessel.

(2)  However, any such direction is taken not to be properly given under this Part unless the person giving the direction has warned the person to whom it is given that it is a direction of the harbour master and that failure to comply with the direction may constitute an offence under section 91.