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IDLER - Member of a crew who works all day but does not keep night watches: e.g. carpenter, sailmaker.

IN IRONS - A sailboat with its bow pointed directly into the wind, preventing the sails from filling properly so that the boat can move

INBOARD - More toward the center of a vessel; inside; a motor fitted inside a boat.

INTRACOASTAL WATERWAY (ICW) - Bays, rivers, and canals along the coasts (such as the Atlantic and Gulf of Mexico coasts), connected so that vessels may travel without going into the sea.

INVERTER - electrical power converter; converts square-wave DC current to sine-wave AC current

IRISH HURRICANE (Also known as Paddy's hurricane) - A flat calm

IRISH PENNANT – An untidy loose end of rope

IRON SPINNAKER / IRON TOPSAIL - auxiliary engine