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	Eng ID	Term	Definition
	4141	quadrantal correctors	Masses of SOFT IRON placed near a MAGNETIC COMPASS to correct for QUADRANTAL DEVIATION. Spherical quadrantal correctors are called quadrant... more Masses of SOFT IRON placed near a MAGNETIC COMPASS to correct for QUADRANTAL DEVIATION. Spherical quadrantal correctors are called quadrantal spheres.
	4142	quadrantal deviation	See DEVIATION.
	4143	quadrantal sphere	See QUADRANTAL CORRECTORS.
	4144	quadrature	An ELONGATION of 90° usually specified as east or west in accordance with the direction of the body from the SUN. The MOON is at quadrature ... more An ELONGATION of 90° usually specified as east or west in accordance with the direction of the body from the SUN. The MOON is at quadrature at first and last quarters. See PHASES OF THE MOON. The situation of two periodic quantities differing by a quarter of a CYCLE.
	4145	quadripod	A four-legged stand for TRIANGULATION, SIGNALS, etc.
	4146	quality control	All procedures which ensure that the product meets certain standards and specifications.
	4147	quality of the bottom	See BOTTOM: NATURE OF.
	4148	quarantine anchorage	An area where a vessel anchors when satisfying quarantine regulations.
	4149	quarantine buoy	A BUOY marking the location of a QUARANTINE ANCHORAGE.
	4150	quarter-diurnal tide(s)	See TIDE.
	4151	quartering sea	WAVES moving in a direction approximately 45° from a vessel's HEADING, striking the vessel on the quarter.
	4152	quarter point	The fourth of the distance from one POINT of the COMPASS to another, equivalent to about two DEGREES and forty-nine MINUTES.
	4153	quartz	Crystalline silica. In its most common form it is colourless and transparent, but it takes a large variety of forms of varying degrees of op... more Crystalline silica. In its most common form it is colourless and transparent, but it takes a large variety of forms of varying degrees of opaqueness and colour. It is the most common solid mineral. Part of the ocean bed is composed of quartz.
	4154	quartz clock	See CLOCK: CRYSTAL.
	4155	quartz horizontal magnetometer	See MAGNETOMETER.
	4156	quay	A WHARF approximately parallel to the SHORELINE and accommodating ships on one side only, the other side being attached to the SHORE. It is... more A WHARF approximately parallel to the SHORELINE and accommodating ships on one side only, the other side being attached to the SHORE. It is usually of solid construction, as contrasted with the open pile construction usually used for PIERS.
	4157	quayage	A comprehensive term embracing all the structures in a PORT alongside which vessels can lie.
	4158	quenching	The great reduction in underwater sound transmission or reception resulting from absorption and SCATTERING of sound energy by air bubbles en... more The great reduction in underwater sound transmission or reception resulting from absorption and SCATTERING of sound energy by air bubbles entrapped around the sonar dome. See ATTENUATION.
	4159	quicksand	A loose mixture of SAND and water that yields to the pressure of heavy objects. Such objects are difficult to extract once they begin sinkin... more A loose mixture of SAND and water that yields to the pressure of heavy objects. Such objects are difficult to extract once they begin sinking.
	4160	quintant	A double-reflecting instrument for measuring angles. It is similar to a SEXTANT, but has an arc of 72°.
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