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| Icw |
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Short for Intercoastal Waterway. A system of rivers and canals along the Atlantic and Gulf Coasts of the United States allowing boats to travel along them without having to go offshore.
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| In Irons |
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A sailboat with its bow pointed directly into the wind, preventing the sails from filling properly so that the boat can move. It can be very difficult to get a boat that is in irons back under sail. An old square rigger could take hours to get underway again.
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| Inboard |
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(1) Toward the center of the boat. (2) An engine that is mounted inside the boat.
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| Inch |
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A unit of measurement used primarily in the United States equal to 2.54 centimeters.
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| Inches of Mercury |
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A unit used when measuring the pressure of the atmosphere. 33.86 millibars. Inches of mercury are used because some barometers use the height of mercury in a sealed tube as a measuring device.
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| Inflatable |
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A dinghy or raft that can be inflated for use or deflated for easy stowage.
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| Inland |
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Away from large bodies of water, surrounded by land. See offshore.
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| Inland Rules |
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Rules for the operation of vessels in harbors, rivers and lakes.
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| Inlet |
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A bay or cove along a river, sea or lake coast line. A stream or bay leading inland. A narrow passage between to bodies of land.
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| Intercoastal Waterway |
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A system of rivers and canals along the Atlantic and Gulf Coasts of the United States allowing boats to travel along them without having to go offshore.
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| International Code of Signals |
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A set of radio, sound, and visual signals designed to aid in communications between vessels without language problems. It can be used with Morse Code, with signal pennants, and by spoken code letters.
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| Irons |
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In irons. A sailboat with its bow pointed directly into the wind, preventing the sails from filling properly so that the boat can move. It can be very difficult to get a boat that is in irons back under sail. An old square rigger could take hours to get underway again.
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| Isobars |
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Lines drawn on a weather map indicating regions of equal pressure. When the lines are close together, this indicates a rapid change in air pressure, accompanied by strong winds.
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| Isogonic Lines |
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A line connecting points of equal magnetic variation on a map.
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