Duties subject to the limit in regulation 3(1)

4.  The duties prescribed in this regulation are any duty—

(a) of an officer of one of Her Majesty’s ships afloat to secure the safe conduct of the ship;

(b) of the quartermaster, bosun’s mate, helmsman or planesman of one of Her Majesty’s ships afloat to execute, or secure the execution of, orders as to the navigation of the ship;

(c) of a member of the crew of any of the following which belongs to, or is being used for the purpose of, any of Her Majesty’s forces—

(i) hovercraft;

(ii) landing craft;

(iii) rigid-hulled inflatable boats;

(iv) raiding craft;

(v) any other vessel, if it belongs to one of Her Majesty’s ships afloat;

(d) as the ship control officer of the watch of one of Her Majesty’s submarines afloat;

(e) as a member of the standing sea emergency party of one of Her Majesty’s ships afloat;

(f) as a member of the harbour duty watch of one of Her Majesty’s ships’;

(g) as a member of the strategic weapons system harbour duty watch of one of Her Majesty’s submarines;

(h) to supervise a hazardous seamanship evolution;

(i) to supervise a maritime lifting operation;

(j) as a member of a boarding party;

(k) as a member of the flight deck crew of one of Her Majesty’s ships;

(l) as a diver;

(m) to supervise a diver;

(n) as a driver or commander of a mechanically propelled vehicle;

(o) to supervise, certify or carry out maintenance on an aircraft;

(p) to authorise a military flight.