Yes, you've got to eat....
With regard to sailing skills, what's to say all the recreational sailors stayed in New York? If they had a boat, I'd imagine they'd have sailed off into the sunset at the first sign of trouble. Those that stayed are likely to have suffered a similar casualty rate as the rest of the populace in the attack and subsequent famines, plagues, riots, etc which would have added to the impulse to get out in any way possible, and a boat ride is a lot better than walking!
Since '97 those few remaining would be exposed to piracy as well as kidnapping, etc (sail for us or else).
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