Question regarding checklists on the NMC website

Disclaimer: I’m still new to the industry (don’t even have my TWIC or MMC yet). So apologies if this is a silly question. I just want to make sense of how these checklists work for future reference.

I’m reading the AB checklist, and I see that it says you need 1080 days of service on Oceans or Great Lakes for the unlimited module. So is “Oceans” the same thing as “OC” in regards to these checklists? What about “NC?” I’m still not too clear on where a vessel sails qualifies as what. Is there perhaps a resource outlining common maritime acronyms and terminology for all these different qualifications/licenses?

Yes OC is oceans and NC is near coastal.

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Your checklist specifically refers to the CFRs. Go there. Definitions are in Title 46 - 10.107.

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And AB requirements are in Title 46 Part 12.

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