nolatom
Contributor
The COI required a licensed mate. But it's either a 97 or 66 registered ton vessel (don't know how to read the COI) and I don't think there is a formal mate license/credential for a less than 100 ton vessel. So don't know.
As I recall the smallest license as captain (or Mate) of an "inspected" vessel is 25 Gross Registered Tons. Same exam and requirements as the 100 ton, but for those who came up on small-ish boats. Next step up is 50 tons, then 100 as I recall.
Generally you can sit for twice the largest tonnage you have experience in. So, much time on a 99 gross-ton boat, and you can sit for the 200-ton license. Geographic limitations too in the small-ton licenses, "Inland" means just that, and "Near Coastal" is up to 200 miles offshore.