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Total record count: 6269.

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	Eng ID	Term	Definition
	501	blow up	Enlarge photographically.
	502	bluff	A CLIFF or HEADLAND with an almost perpendicular face.
	503	blunder	See ERROR: GROSS.
	504	boat compass	See COMPASS.
	505	boat grid	See CAREENING GRID or GRIDIRON.
	506	boat sheet	(U.S. terminology). The work sheet used by the HYDROGRAPHER in the field for plotting the details of a HYDROGRAPHIC SURVEY as it progresses.... more (U.S. terminology). The work sheet used by the HYDROGRAPHER in the field for plotting the details of a HYDROGRAPHIC SURVEY as it progresses. See also FIELD BOARD.
	507	boat slip	A SLIPWAY designed specifically for boats.
	508	bog	Wet spongy ground consisting of decaying vegetation, which retains stagnant water, too soft to bear the weight of any heavy body.
	509	bold coast	A prominent land mass that rises steeply from the SEA.
	510	bollard	Small shaped post, mounted on a wharf or dolphin used to secure ship's lines. Also see MOORING.
	511	boom	A floating barrier used to protect a river or harbour mouth or to create a sheltered area for storage purposes.
	512	boomer	Seismic instrument for shallow penetration work. The boomer TRANSDUCER produces acoustic pulses by the motion of a metal plate in the water.
	513	border	The district lying along the edge of a country or territory; a frontier. The boundary line which separates one country from another, the fro... more The district lying along the edge of a country or territory; a frontier. The boundary line which separates one country from another, the frontier line.
	514	border break	A cartographic technique to extend cartographic detail of a map or chart beyond the neatline into the margin to show important features. Thi... more A cartographic technique to extend cartographic detail of a map or chart beyond the neatline into the margin to show important features. This technique eliminates the necessity of producing an additional CHART. Also called Blister.
	515	border of chart	The NEATLINE defining the limits of the area charted.
	516	borderland	A region adjacent to a CONTINENT, normally occupied by or bordering a SHELF and sometimes emerging as islands, that is irregular or blocky i... more A region adjacent to a CONTINENT, normally occupied by or bordering a SHELF and sometimes emerging as islands, that is irregular or blocky in plan or profile, with DEPTHS well in excess of those typical of a SHELF.
	517	border scale	See SCALE.
	518	bore	A high breaking WAVE of water, advancing rapidly up an ESTUARY. Bores can occur at the MOUTHS of shallow RIVERS if the TIDE RANGE at the MOU... more A high breaking WAVE of water, advancing rapidly up an ESTUARY. Bores can occur at the MOUTHS of shallow RIVERS if the TIDE RANGE at the MOUTH is large. They can also be generated in a RIVER when TSUNAMIS enter shallow coastal water and propagate up the RIVER. Also called eager, mascaret, or tidal bore.
	519	boring	Forcing a vessel under power through ICE.
	520	bottom	Any GROUND covered by water.
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