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In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. [1] In commercial vessels, the latter criterion measured relative to the ship's load line , regardless of deck arrangements, is the mandated and regulated meaning.
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Downwind polar diagram to determine potential yacht speeds at various wind speeds for a sailboat. A polar diagram, or polar plot, is a graph that shows a sailboat's potential speed over a range of wind speeds and relative wind angles. [1]
Day shapes are mast head signals visually indicating the status of a vessel to other vessels on navigable waters during daylight hours whether making-way, anchored, or aground.
A ship's draft/draught is the "depth of the vessel below the waterline measured vertically to the lowest part of the hull, propellers, or other reference point". [1] That is, the draft or draught is the maximum depth of any part of the vessel, including appendages such as rudders, propellers and drop keels if deployed.
The capsize screening formula (CSF) is a controversial method of establishing the ability of boats to resist capsizing. It is defined for sailboats as: Beam / ((Displacement/64.2) 1/3), with Displacement measured in pounds, and Beam in feet. A lower figure supposedly indicates greater stability, however the calculation does not consider factors ...
On US naval vessels, bells additionally are rung as "boat gongs" for officers and dignitaries coming aboard or leaving the ship, in a number equivalent to the number of sideboys to which the visitor is entitled. [5] At midnight on New Year's Eve, 16 bells would be struck – eight bells for the old year and eight bells for the new.
Smiths Knoll Smiths Knoll 52°43′30″N 2°18′0″E [22] Trinity House: North Sea: Leman and Ower Trinity House: North Sea: Longsand 51°47′40″N 1°40′0″E [28] Trinity House: Thames Estuary: Lune Deep 53°56′48″N 3°7′56″W: Trinity House: Morecambe Bay: Unattended gas lit "lightboat", established 1909: Mid Barrow Barrow Deep ...
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