15 fathoms in 1 shackle
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220 fathoms = 1,320 feet or 1/4 mile.
1 fathom = 6 feet so 4000 feet = 4000/6 = 666.6667 fathoms.
There are 6 feet in a fathom. Therefore, one foot is equal to 1/6 = 0.16 recurring (that is, 0.16666...) fathoms.
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A shackle is a unit of measure of anchor chains which is equal to 90 feet.