To clear a dock.
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JACKSTAY
An iron rod bolted clear of the mainmast, to which the luff of the mainsail is laced.
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AWEIGH
The position of anchor as it is raised clear of the bottom.
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ISOLATED DANGER BUOY
An IALA navigation aid marking a danger with clear water all around; it has a double ball topmark and is black with at least one red band. If lighted its characteristic is Fl(2).
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ISOLATED DANGER MARK (OR BUOY)
An IALA navigation aid marking a danger with clear water all around; it has a double ball topmark and is black with at least one red band. If lighted its characteristic is Fl(2).
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TACKING DUELS
In sailboat racing on an upwind leg of the race course the complex manoeuvres of lead and overtaking boats to vie for the aerodynamic advantage of clear air. This results from the ongoing strategy of the lead boat's effort to keep the following boat(s) in the blanket of disturbed bad air he is creating.
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LEADING LINE
On a nautical chart, a straight line, drawn through leading marks. A ship moving along such line will clear certain dangers or remain in the best channel.
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CUSTOMS BROKER
This person prepares the needed documentation for importing goods (just as a freight forwarder does for exports). The broker is licensed by the Treasury Department to clear goods through U.S. Customs. Performs duties related to documentation, cargo clearance, coordination of inland and ocean transportation, dockside inspection of cargo, etc. (Also known as a customhouse broker.)
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CHART SOUNDING DATUM
The tidal datum to which soundings and drying heights on a chart are referred. It is usually taken to correspond to a low water stage of the tide. Often shortened to CHART DATUM, especially when it is clear that reference is not being made to a geodetic datum.
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CLEARANCE
The clear space between two objects, such as the nearest approach of a vessel to a navigational light, hazard to navigation, or other vessel
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DUST DEVIL
A well-developed dust whirl, a small but vigorous whirlwind, usually of short duration, rendered visible by dust, sand, and debris picked up from the ground. Diameters of dust devils range from about 10 feet to greater than 100 feet; their average height is about 600 feet, but a few have been observed as high as several thousand feet. They have been observed to rotate anticyclonically as well as cyclonically. Dust devils are best developed on a hot, calm after- noon with clear skies, in a dry region when intense surface heating causes a very steep lapse rate of temperature in the lower few hundred feet of the atmosphere.
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