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	Eng ID	Term	Definition
	4341	refraction of water waves	The process by which the direction of a WAVE moving in SHALLOW WATER at an angle to the contours is changed. That part of the WAVE advancing... more The process by which the direction of a WAVE moving in SHALLOW WATER at an angle to the contours is changed. That part of the WAVE advancing in shallower water moves more slowly than the other part still advancing in deeper water, causing the WAVE CREST to bend toward alignment with the underwater contours. Also called wave refraction. The bending of WAVE CRESTS by CURRENTS.
	4342	refuge	A place of safety for a vessel in danger.
	4343	regime	In CLIMATOLOGY, term used to characterize the seasonal distribution of one or more elements at a given place.
	4344	registration	Correct positioning of one component of a composite map image in relation to the other components. Achieved, for example, by punching sets ... more Correct positioning of one component of a composite map image in relation to the other components. Achieved, for example, by punching sets of holes, having a fixed horizontal relationship to each other, in each component sheet and then attaching the components together using specially designed fasteners. See also PUNCH REGISTER SYSTEM.
	4345	region A,B	Within the IALA Maritime Buoyage System there are two international buoyage regions, designated as Region A and Region B, where lateral mar... more Within the IALA Maritime Buoyage System there are two international buoyage regions, designated as Region A and Region B, where lateral marks differ only in the colours of port and starboard hand marks.
	4346	regression of the nodes	Precessional motion of a set of NODES. The expression is used principally with respect to the MOON, the NODES of which make a complete west... more Precessional motion of a set of NODES. The expression is used principally with respect to the MOON, the NODES of which make a complete westerly REVOLUTION in approximately 18.6 years.
	4347	regular error	See ERROR: SYSTEMATIC.
	4348	relative accuracy	See ACCURACY: RELATIVE.
	4349	relative aperture	See APERTURE: RELATIVE.
	4350	relative bearing	See BEARING.
	4351	relative humidity	The ratio of the actual vapor pressure to the vapor pressure corresponding to saturation at the prevailing temperature.
	4352	relative motion	Motion of one object or body relative to another. The expression is usually used in connection with problems involving motion of one craft, ... more Motion of one object or body relative to another. The expression is usually used in connection with problems involving motion of one craft, torpedo, or missile relative to another, the direction of such motion being called direction of relative movement, and the SPEED of such motion being called speed of relative movement or relative speed. Usually called apparent motion when applied to the change of position of a CELESTIAL BODY as observed from the EARTH. Also called relative movement.
	4353	relative orientation	See ORIENTATION.
	4354	relative position	See POSITION.
	4355	relative speed	See RELATIVE MOVEMENT.
	4356	relative tilt	See TILT.
	4357	relative wind	For a moving object, WIND VECTOR relative to this object. Also called apparent wind. See TRUE WIND.
	4358	release	A device for holding or releasing a mechanism, particularly the device by which the TANGENT SCREW of a SEXTANT or surveying instrument is h... more A device for holding or releasing a mechanism, particularly the device by which the TANGENT SCREW of a SEXTANT or surveying instrument is held in place or disengaged from the LIMB, or CIRCLE respectively. In oceanography acoustic releases are used to sever deployed instruments from their anchoring.
	4359	relief	The ELEVATIONS or the inequalities, collectively, of a land surface; represented on a MAP or CHART by CONTOURS, HYPSOMETRIC TINTS, SHADING... more The ELEVATIONS or the inequalities, collectively, of a land surface; represented on a MAP or CHART by CONTOURS, HYPSOMETRIC TINTS, SHADING, SPOT ELEVATIONS, HACHURES, etc.
	4360	relief: submarine	Inequalities of the ocean bed, or their representation on a CHART.
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