What is a Letter of Equivalency?

A document issued by a flag State Administration to an organisation to confirm that a specified fitting, material, appliance or apparatus produced by the organisation will be deemed equivalent to a statutory requirement of the Administration. 

For example, under a Letter of Equivalency issued by the MCA to Regs4ships Ltd (www. regs4ships. com), UK ships may, subject to certain provisos, obtain M Notices on-line from that organisation instead of carrying paper M Notices as required by The Merchant Shipping (Safety of Navigation) Regulations 2002. Several other flag State Administrations have issued similar Letters of Equivalency to Regs4ships.


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In which section of the MCA website is guidance on equivalency arrangements for charts and nautical publications?

Does MARPOL permit equivalents?