21A.3.1 There should be adequate and reasonable
headroom for all seafarers on board taking into consideration the
size and operation of vessel. Headroom provided should not result
in discomfort to the seafarers onboard.
21A.3.2 For spaces where seafarers are expected
to stand for prolonged periods, the minimum headroom should be 190
centimetres. The competent authority may allow reduced height in some
locations if it does not result in discomfort to seafarers.