A person who sets boats in position, prepares them for use, or arranges boats in a specific formation or location.
Compound of 'boat' and 'setter' (from 'set', Old English 'settan', meaning 'to place' or 'to put'). The '-er' suffix creates an agent noun for someone who performs the action of setting.
This is an obscure occupational term that would have been specific to boat-building communities or harbors where launching and positioning boats required specialized knowledge—it's the kind of hyper-specific job title that medieval trades created!
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