questionText: To ask the Secretary of State for Defence, how many merchant seafarers were employed on vessels chartered by the UK Hydrographic Office in each year since 2015-16.
answerText: YearMerchant seafarers employed on vessels chartered by the UK Hydrographic Office2015-161 for 66 days2016-1702017-181 for 20 days2018-1902019-2002021-2202022-232 for 28 days2023/2402024-250 
heading: Merchant Shipping: Employment