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30 shackles is about one-one-hundred-fiftieth as long as The English Channel.
In other words, it's 0.00769 times the length of The English Channel, and the length of The English Channel is 130 times that amount.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 3,900 shackles, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
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