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JACOBS LADDER

a rope ladder, lowered from the deck, as when pilots or passengers come aboard.

JETTY

A structure, usually masonry, projecting out from the shore; a jetty may protect a harbor entrance.

Jib

a foresail, a triangle shaped sail forward of the mast

Jibe

a change of tack while going downwind

JONES ACT

Merchant Marine Act of 1920, Section 27, requiring that all U.S. domestic waterborne trade be carried by U.S.-flag, U.S.-built, and U.S.-manned vessels.

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