Essential for all vessels who wish to enter an Emission Control Area, at berth in a United Kingdom port, a UK passenger ship operating in UK waters, controlled waters, and any other passenger ship which calls at a port in the UK.
 
'The Merchant Shipping (Prevention of Air Pollution from Ships) Regulation 2008', as amended, require the master of a ship - to which the regulation apply - to make a record to demonstrate compliance for any ship using separate fuel oils and make a record of any fuel changeover operation.