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	Eng ID	Term	Definition
	541	box compass	See DECLINATOIRE.
	542	box gauge	See GAUGE: FLOAT.
	543	box sextant	A small portable instrument used for approximate measurement of angles.
	544	brackish water	Water in which salinity values range from approximately 0.50 to 17.00 parts per thousand.
	545	brash ice	Accumulation of FLOATING ICE made up of small fragments not more than 2 metres across; the wreckage of other forms of ICE.
	546	breaker	A WAVE breaking on the SHORE, over a REEF, etc. Breakers may be roughly classified into three kinds, although the categories may overlap: sp... more A WAVE breaking on the SHORE, over a REEF, etc. Breakers may be roughly classified into three kinds, although the categories may overlap: spilling breakers break gradually over a considerable distance; plunging breakers tend to curl over and break with a crash; and surging breakers peak up, but then instead of spilling or plunging they surge up on the beach face. The French word 'brisant' is also used for the obstacle causing the breaking of the WAVE.
	547	breaking of waves	Disintegration of a WAVE which breaks with foam in SHALLOWS whose gradient is more or less regular. An incomplete breaking can likewise resu... more Disintegration of a WAVE which breaks with foam in SHALLOWS whose gradient is more or less regular. An incomplete breaking can likewise result from a sudden reduction in DEPTH.
	548	breakwater	A structure protecting a shore area, HARBOUR, ANCHORAGE, or BASIN from WAVES. See also FLOATING BREAKWATER.
	549	breeze	A WIND of moderate strength. See LAND and SEA (or LAKE) BREEZE.
	550	bridge	1. An elevated structure extending across or over the weather deck of a vessel, or part of such a structure. The term is sometimes modified ... more 1. An elevated structure extending across or over the weather deck of a vessel, or part of such a structure. The term is sometimes modified to indicate the intended use, such as navigating bridge or signal bridge. 2. A structure erected over a depression or an obstacle such as a body of water, railroad, etc., to provide a roadway for vehicles or pedestrians.
	551	bridge: bascule	A counterpoise bridge rotated in a vertical plane about an axis at one or both ends. Also called balance bridge.
	552	bridge: draw	A general name for bridges of which part or the entire span of the bridge may be raised or drawn aside to allow ships to pass through.
	553	bridge: lift	A movable bridge which is capable of being lifted vertically to allow vessels to pass beneath.
	554	bridge: swing	A movable bridge which rotates in a horizontal plane about a vertical pivot to allow the passage of vessels.
	555	bridge clearance	See CLEARANCE.
	556	bridging	See STEREOTRIANGULATION.
	557	broad on the beam	Bearing 090° relative (broad on the starboard beam) or 270° relative (broad on the port beam). If the bearings are approximate, the expres... more Bearing 090° relative (broad on the starboard beam) or 270° relative (broad on the port beam). If the bearings are approximate, the expression on the beam or abeam should be used. See also ON THE BEAM.
	558	broad on the bow	Bearing 045° relative (broad on the starboard bow) or 315° relative (broad on the port bow). If the bearings are approximate, the expressi... more Bearing 045° relative (broad on the starboard bow) or 315° relative (broad on the port bow). If the bearings are approximate, the expression on the bow should be used. See also ON THE BOW.
	559	broad on the quarter	Bearing 135° relative (broad on the starboard quarter) or 225° relative (broad on the port quarter). If the bearings are approximate, the ... more Bearing 135° relative (broad on the starboard quarter) or 225° relative (broad on the port quarter). If the bearings are approximate, the expression on the quarter should be used. See also ON THE QUARTER.
	560	broadcast	Communication by RADIO intended for reception at any point within a specified area.
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