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The aftermost transverse deck beam

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BEAM

The width of a ship. Also called breadth.

BREADTH

The width of a ship.

FREEBOARD DECK

Deck to which freeboard is measured

HALF-POWER POINTS

Power ratios used to define the angular width of a radar beam. One convention defines beam width as the angular width between points at which the field strength is 71 percent of its maximum value. Expressed in terms of power ratio, this convention defines beam width as the angular width between half-power points. A second convention defines beam width as the angular width between points at which the field strength is 50 percent of its maximum value. Expressed in terms of power ratio, the latter convention defines beam width as the angular width between quarter- power points.

TWEEN DECK

The space between any two adjacent decks

INDIRECT ECHO

A radar echo which is caused by the electromagnetic energy being transmitted to the target by an indirect path and returned as an echo along the same path. An indirect echo may appear on the radar display when the main lobe of the radar beam is reflected off part of the structure of the ship (the stack for example) from which it is reflected to the target. Returning to own ship by the same indirect path, the echo appears on the PPI at the bearing of the reflecting surface. Assuming that the additional distance by the indirect path is negligible, the indirect echo appears on the PPI at the same range as the direct echo received. Also called FALSE ECHO.

FLUSH DECK

The upper deck of a vessel that extends unbroken from stem to stern.

FUTTOCK

A piece of timber that make up a large transverse frame.

SADDLE CHOCK

A transverse beam placed over the transom with fairleads for mooring warps.

SADDLE CHOCK

A transverse beam placed over the transom with fairleads for mooring warps.
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