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	Eng ID	Term	Definition
	4481	route: recommended	A route of undefined width, for the convenience of ships in transit, which is often marked by centreline buoys.
	4482	route (or routeing) chart	See CHART.
	4483	routeing	A complex of measures concerning routes followed by ships and aiming at reducing the risk of casualties (TRAFFIC SEPARATION SCHEMES, DEEP-... more A complex of measures concerning routes followed by ships and aiming at reducing the risk of casualties (TRAFFIC SEPARATION SCHEMES, DEEP-DRAUGHT ROUTES, areas to be avoided, etc.).
	4484	routeing guide	A document designed to be used in conjunction with nautical charts and other nautical publications in areas where complex routeing systems h... more A document designed to be used in conjunction with nautical charts and other nautical publications in areas where complex routeing systems have been established by the IMO.
	4485	routeing system	Any system of one or more routes or routeing measures aimed at reducing the risk of casualties; it includes traffic separation schemes, tw... more Any system of one or more routes or routeing measures aimed at reducing the risk of casualties; it includes traffic separation schemes, two-way routes, recommended tracks, areas to be avoided, inshore traffic zones, roundabouts, precautionary areas and deep-water routes.
	4486	rubble	Fragments of hard SEA ICE, roughly spherical and up to 1,5 METRES (5 FEET) in diameter, resulting from the disintegration of larger ice form... more Fragments of hard SEA ICE, roughly spherical and up to 1,5 METRES (5 FEET) in diameter, resulting from the disintegration of larger ice formations. When afloat, commonly called BRASH ICE. Loose angular rock fragment.
	4487	rubidium vapour magnetometer	See MAGNETOMETER.
	4488	rudite (or rudyte)	Rock or sediment DEPOSITS composed of grains larger than 2 millimetres.
	4489	ruin	A ruin is a structure in a decayed or deteriorated condition resulting from neglect or disuse, or a damaged structure in need of repair. A... more A ruin is a structure in a decayed or deteriorated condition resulting from neglect or disuse, or a damaged structure in need of repair. A ruin is considered hazardous if it extends over or into navigable waters and thus represents a danger to surface navigation.
	4490	ruling	A mechanically produced series of equally-spaced parallel lines at a predetermined 'angle of ruling'. Used to distinguish particular areas o... more A mechanically produced series of equally-spaced parallel lines at a predetermined 'angle of ruling'. Used to distinguish particular areas of a MAP by providing a paler shade of the full printing colour.
	4491	run	A BROOK, or small CREEK. The distance travelled by a craft during any given time interval, or since leaving a designated place. Complete per... more A BROOK, or small CREEK. The distance travelled by a craft during any given time interval, or since leaving a designated place. Complete performance of one PROGRAMME on a COMPUTER.
	4492	run a line of soundings	(v.t.). To obtain SOUNDINGS along a LINE OF SOUNDING, for surveying purposes.
	4493	runnel	The smallest of natural STREAMS; a BROOK or RUN. A TROUGH or corrugation formed in the FORESHORE or in the BOTTOM, immediately offshore, for... more The smallest of natural STREAMS; a BROOK or RUN. A TROUGH or corrugation formed in the FORESHORE or in the BOTTOM, immediately offshore, formed by WAVES or TIDAL CURRENTS.
	4494	running fix	See FIX.
	4495	running survey	See SURVEY.
	4496	run of micrometer	See ERROR OF RUN.
	4497	run-up	The rush of water up a structure on the breaking of a WAVE. The amount of run-up is the vertical HEIGHT above STILL WATER LEVEL that the r... more The rush of water up a structure on the breaking of a WAVE. The amount of run-up is the vertical HEIGHT above STILL WATER LEVEL that the rush of water reaches. See UPRUSH.
	4498	runway	A defined area, on a land aerodrome, prepared for the landing and take-off run of aircraft.
	4499	runway light(s)	See LIGHT.
	4500	sac	An INDENTATION in the CONTOURS on a CHART showing SUBMARINE RELIEF which is analogous to a GULF on the surface. The opposite term is SUBMARI... more An INDENTATION in the CONTOURS on a CHART showing SUBMARINE RELIEF which is analogous to a GULF on the surface. The opposite term is SUBMARINE PENINSULA.
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