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Hi K1W1,
Been out out town annoying captains and engineers so missed this post.
A new build will have Tier2 engines and a re-egined vessel should have them.
But, it isn't just the EPA, it is MARPOL as well so is an international issue. Unless the boat is 400 tons or over there isn't going to be much checking by port state control (as if there is in the yachting biz anyway) but >400t an EIAPP is required and the big thing there is adherence to the engine's Technical File. That means strict record keeping of part numbers and sources for injectors, pumps, and other emissions related components in order to maintain conformity with the NOx Code.
This is far more than "an issue for manufacturers to deal with." It is part of an engineer's responsibility to maintain compliance by careful attention to maintenance and parts sources. It is as important as any other class issue and will probably become a much larger issue in the near future.
Both IMO and EPA websites have quite a bit of information available.
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