I think manning requirements definitely need a look or at least a discussion. Things to consider:
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requiring a licensed engineer for anything greater than 2000 HP or 70 feet long
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A discussion on the introduction for a 3 watch system for voyage plans over a 5 day duration. I know STCW the cutoff is 600 miles but I think the inland companies would try to get around this. Many runs on the Mississippi River are over 600 miles with 2 wheelman.
Also, tankerman restricted license is not needed on board towing vessels to fuel up until Subchapter M is fully phased in on July 19, 2022.