For each ship subject to regulations 5 and 6 of Annex VI (i. e. ships required to be surveyed and have an IAPP Certificate), details of fuel oil for combustion purposes delivered to and used on board must be recorded by means of a bunker delivery note which must contain at least the information specified in appendix V to Annex VI. The bunker delivery note must be kept on board, readily available for inspection at all reasonable times and retained for three years after the fuel oil has been delivered on board.