There is no limitation on exemption certificates. A certificate could be given to any master of any ship because the Minister and the draftsmen have not provided specific detail. Any master of any ship can gain a certificate. Masters will have to satisfy certain conditions in respect of their knowledge of a port, including the regularity of their entries into and departures from it. But is it right that a competent harbour authority—it will be only the authority, not the Secretary of State, Trinity House or the Pilotage Commission—should have sole responsibility for the granting of a certificate?