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	Eng ID	Term	Definition
	4681	settlement	The general lowering in level of a moving vessel, relative to what its level would be were it motionless. Settlement is due to the regional ... more The general lowering in level of a moving vessel, relative to what its level would be were it motionless. Settlement is due to the regional depression of the surface of the water in which the ship moves. It is not an increase in displacement. Settlement is a factor to be reckoned in ECHO SOUNDING.
	4682	sexagesimal	An angular division whereby a circle is divided in 360 equal parts called degrees. A degree is divided in 60 minutes and one minute in 60 se... more An angular division whereby a circle is divided in 360 equal parts called degrees. A degree is divided in 60 minutes and one minute in 60 seconds.
	4683	sextant	A double-reflecting instrument for measuring angles, primarily ALTITUDES of CELESTIAL BODIES. The sextant has an arc of 60°, a sixth of a ci... more A double-reflecting instrument for measuring angles, primarily ALTITUDES of CELESTIAL BODIES. The sextant has an arc of 60°, a sixth of a circle, from which it derives its name, and a RANGE of 120°. In modern practice the term also applies to a similar instrument, regardless of its RANGE. See also OCTANT, QUADRANT and QUINTANT.
	4684	sextant: air	A SEXTANT designed primarily for AIR NAVIGATION. Air sextants are generally provided with some form of ARTIFICIAL HORIZON.
	4685	sextant: bubble	A SEXTANT with a bubble or SPIRIT LEVEL to indicate the horizontal.
	4686	sextant: gyro	A SEXTANT provided with a GYROSCOPE to indicate the horizontal.
	4687	sextant: hydrographic	See SEXTANT: SOUNDING.
	4688	sextant: marine	A SEXTANT designed primarily for MARINE NAVIGATION.
	4689	sextant: pendulum	A SEXTANT provided with a PENDULUM to indicate the horizontal.
	4690	sextant: sounding	(British terminology). A simplified and more robustly constructed version of the marine sextant intended primarily for use in HYDROGRAPHIC S... more (British terminology). A simplified and more robustly constructed version of the marine sextant intended primarily for use in HYDROGRAPHIC SURVEY. It has no SHADES, a wide angle low magnification telescope and is generally graduated in MINUTES of arc. It may be fitted with either a VERNIER or a MICROMETER reading device. Both mirrors are silvered all over to enable angles up to 180° to be measured. Some sounding sextants have a 90° prism attachment which reflects the normal direct LINE OF SIGHT 90° to the left. Called surveying sextant, or hydrographic sextant in U.S. terminology.
	4691	sextant: surveying	See SEXTANT: SOUNDING.
	4692	sextant adjustment	The process of checking the ACCURACY of a SEXTANT and removing or reducing its ERROR.
	4693	sextant altitude	See under ALTITUDE.
	4694	sextant altitude correction	Any of several CORRECTIONS applied to a SEXTANT ALTITUDE in the process of converting it to TRUE ALTITUDE.
	4695	sextant chart	See CIRCLE SHEET.
	4696	sextant error	See ERROR.
	4697	sextometer method	A substitute for PLANE TABLE TRAVERSE for short distances in unimportant areas where the use of the PLANE TABLE is impracticable and the su... more A substitute for PLANE TABLE TRAVERSE for short distances in unimportant areas where the use of the PLANE TABLE is impracticable and the survey party operates in a LAUNCH. AZIMUTH is carried forward by means of angles accurately measured with a SEXTANT. Distance is determined by measuring, also with the SEXTANT, the small horizontal angle between fixed TARGETS on a special rod held horizontally. The angle may be converted into a distance by means of a HYPSOGRAPH.
	4698	shade	A coloured glass that can be moved into the LINE OF SIGHT of an optical instrument, such as a SEXTANT, to reduce the intensity of light rea... more A coloured glass that can be moved into the LINE OF SIGHT of an optical instrument, such as a SEXTANT, to reduce the intensity of light reaching the eye. Also calledshade glass. See HORIZON SHADE, and INDEX SHADE.
	4699	shaded relief	See ILLUMINATED RELIEF.
	4700	shade glass	See SHADE.
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