Regulation 4

( a ) A ship which is not normally engaged on international voyages but which, in exceptional circumstances, is required to undertake a single international voyage may be exempted by the Director from any of the requirements of these Regulations provided that it complies with safety requirements which are adequate in the opinion of the Director for the voyage which is to be undertaken by the ship. ( b ) The Director may exempt any ship which embodies features of a novel kind from any of the provisions of Chapters II-1, II-2, III and IV of these Regulations the application of which might seriously impede research into the development of such features and their incorporation in ships engaged on international voyages. Any such ship shall, however, comply with safety requirements which, in the opinion of the Director are adequate for the service for which it is intended and are such as to ensure the overall safety of the ship. ( c ) For the purpose of paragraph ( b ), the requirements of the following Codes wherever applicable shall be complied with to the satisfaction of the Director: (i) dynamically supported craft with the Code of Safety for Dynamically Supported Craft adopted by the Organisation by resolution A 373 (X) as amended from time to time; (ii) special purpose ships of not less than 500 tons carrying more than 12 special personnel with the Code of Safety for Special Purpose Ships adopted by the Organisation by resolution A 534 (XIII) as amended from time to time; and (iii) mobile offshore drilling units with the Code for Mobile Offshore Drilling Units adopted by the Organisation by resolution A 414 (XI).