Lifejackets should be fitted with patches of retro-reflective
materials with a total area of at least 400 cm2 distributed
so as to be useful for search from air and surface craft from all
directions. In the case of a reversible lifejacket, the arrangement
should be complied with no matter which way the lifejacket is put
on. Such material should be placed as high up on the lifejacket as
possible.