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According to international marine standart (offshore) .
If you are in the project then it is according to the project safety plan. If the requirement is not written in the safety plan then the standard to follow is the local standard of the country where the project is located otherwise the international standard will work that is OSHA.
On board what is the question? The information you have supplied is not detailed enough. If this is to do with scaffolding, then look at NASC SG4:15.
If this is just a general area looking at protection, then search for collective fall protection measures. Numerous ideas and articles on the net concerning this subject. I like using the UKHSE website. Very informative.