The Director may issue in accordance with Part D of the National Standard for Commercial Vessels a certificate of competency of the following grades—
(a) Master Class 3;
(b) Master Class 4;
(c) Master Class 5;
(d) Mate Class 4;
(e) Coxswain;
(f) Skipper Grade 1;
(g) Skipper Grade 2;
(h) Skipper Grade 3;
(i) Engineer Class 3;
(j) Marine Engine Driver Grade 1;
(k) Marine Engine Driver Grade 2;
(l) Marine Engine Driver Grade 3.