A seaman provides 3 things... repair, restore, and a boost to most other sailors abilities. A BVE high level seaman provides a substantial bonus. It's been my experience that 4 Engineers + 1 Seaman is just as good as 5 Engineers for overheat speed and time but also gives you significant increase to Repair, Aircraft Skill, and Gunnery (assuming you're not capped, which you likely are by then).
Don't expect much out of a seaman before level 80, as the percentage increase is really too small to measure before then. And seamen don't stack like Repairers do, so having more than one is less efficient for a number of reasons. (The fact that they improve everyone else means you want as many "everyone elses" as you can get.)
It also doesn't seem like Seaman have a cap on their ability. A level 120 seaman with 300 vets can enable level 70 fighters to perform as though they were MUCH higher level, for example, though hard numbers are difficult to get.
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