(c) prescribing the qualifications to be possessed for obtaining a certificate as navigator or as officer serving in any other capacity;
(d) for holding examinations of candidates for certificates and for such examinations being conducted on behalf of the Board of Trade by other bodies;
(e) as to the issue of new certificates in place of certificates which have been lost or destroyed;
(f) as to the cancellation, suspension, endorsement and delivery up of certificates of competency;
(g) as to the recognition of certificates of competency issued to navigators and other officers under the laws of any British possession or foreign nation which appear to the Board effective for ascertaining and determining their competency;
(h) as to the fees to be paid on the grant of a certificate and by candidates entering for examination.
(3) The regulations shall provide for different certificates of competency being issued in respect of different classes of aircraft, and a navigator or other officer shall not be deemed to be duly certificated in respect of an aircraft of any class unless he is the holder for the time being of a valid certificate of competency under this section in respect of that class of craft, and of a grade appropriate to his station in the aircraft or of a higher grade.
(4) If any person—
(a) navigates or allows to be navigated any aircraft not provided with a duly certificated navigator, and, in the case of any aircraft which is under the regulations required to be provided with other certificated officers, without such other officers; or,
(b) having been engaged as a navigator or other officer required to be certificated, navigates, or takes part in the navigation of, an aircraft without being duly certificated; or