Application of Part III
11. This Part applies to any such person as follows (in this Part referred to as “a master”), that is to say—
(a)a person who has command of a vessel to which this Part applies in the course of his employment and;
(b)a person who has command of such a vessel for the purposes of a trade or business carried on by him;
and in this Part references to a person’s having command are references to his having command as aforesaid.