A little bit of internet / government history here: the DirectGov page about identifying different types of wave
https://webarchive.nationalarchives.gov.uk/ukgwa/20120405212659/http://www.direct.gov.uk/en/TravelAndTransport/Boatingandtravellingbywater/Keepingsafeatthecoast/DG_185489
@gilest graaaargh
@rgarner sigh
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