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	Eng ID	Term	Definition
	4921	spatial	(adj.). Pertaining to or limited by space.
	4922	special mark	In the IALA Maritime Buoyage System, a special mark indicates an area or FEATURE referred to in NAUTICAL documents; it is not primarily inte... more In the IALA Maritime Buoyage System, a special mark indicates an area or FEATURE referred to in NAUTICAL documents; it is not primarily intended to assist NAVIGATION.
	4923	special purpose map	See MAP.
	4924	specific gravity	The ratio of the density of a substance at a given temperature and the density of some other substance used as a STANDARD. For liquids and... more The ratio of the density of a substance at a given temperature and the density of some other substance used as a STANDARD. For liquids and solids, the STANDARD assumed is the density of distilled water at 4°C.
	4925	spectroscope	An optical instrument for forming SPECTRA. It is very useful in studying the characteristics of CELESTIAL BODIES.
	4926	spectrum	(pl. spectra). A series of IMAGES formed when a BEAM of RADIANT ENERGY is separated into its various WAVE LENGTH components, as when a BEAM ... more (pl. spectra). A series of IMAGES formed when a BEAM of RADIANT ENERGY is separated into its various WAVE LENGTH components, as when a BEAM of white light is refracted and dispersed by a prism. The entire RANGE of electromagnetic RADIATIONS, or any part of it used for a specific purpose, as the RADIO SPECTRUM (10 kilohertz to 300,000 MEGAHERTZ).
	4927	specular reflection	The type of reflection, in optics or microwave theory, characteristic of a highly polished plane surface from which all rays are reflected... more The type of reflection, in optics or microwave theory, characteristic of a highly polished plane surface from which all rays are reflected at an angle equal to the angle of incidence.
	4928	speed	Rate of motion. The terms speed and VELOCITY are often used interchangeably, but speed is a scalar, having magnitude only, while VELOCITY ... more Rate of motion. The terms speed and VELOCITY are often used interchangeably, but speed is a scalar, having magnitude only, while VELOCITY is a vector quantity, having both magnitude and direction. Speed may either be the ship's speed through water, or the SPEED MADE GOOD over ground.
	4929	speed: angular	Change of direction per unit time. Also called angular rate or angular velocity.
	4930	speed: ground	See GROUND SPEED.
	4931	speed: linear	Rate of motion in a straight line.
	4932	speed: relative	See RELATIVE MOTION.
	4933	speed line	A LINE OF POSITION approximately perpendicular to the COURSE.
	4934	speed made good	The actual velocity of the ship along a course measured in relation to the ocean bottom or to fixed objects ashore.
	4935	speed of lens	See APERTURE: RELATIVE.
	4936	speed of propagation	The speed with which waves of energy travel through or along a medium other than a specially constructed path.
	4937	speed of relative movement	See RELATIVE MOTION.
	4938	speed of sound	The SPEED OF PROPAGATION of sound waves .
	4939	speedometer	An ODOMETER recording the SPEED of a craft by a process of differentiation.
	4940	speed scale	See SCALE.
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