>>1123535Tl;dr if you’re on a tug doing two six hour watches in a 24 hour period it counts as a day and a half
If you’re on an OSV or crewboat doing 12 hour watches it’s also a day and a half
Here’s some links straight from the NMC if you want some more clarification
http://www.dco.uscg.mil/Portals/9/NMC/pdfs/professional_qualifications/crediting_sea_service.pdfhttp://www.dco.uscg.mil/Portals/9/NMC/pdfs/professional_qualifications/time_half_credit.pdfBased off my experience they don’t seem to be super strict with it either.