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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.