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	Eng ID	Term	Definition
	1921	foresight	In LEVELLING, a reading on a LEVELLING ROD held on a point whose ELEVATION is to be determined. See also BACKSIGHT.
	1922	format	The general plan or arrangement of a product. Specification of succession and type of representation of elements of information (numbers, ... more The general plan or arrangement of a product. Specification of succession and type of representation of elements of information (numbers, text) on a medium. A fixed format is equivalent to a table, while free formats use delimiters to separate individual elements or "tags" (based on a directory) to identify elements. A set of formats or a complex format determines the structure of how information is represented on a medium.
	1923	formation sounding	See SOUNDING.
	1924	form lines	Lines drawn to represent the shape of TERRAIN; unlike CONTOUR LINES, these are drawn without regard to a true vertical DATUM or regular vert... more Lines drawn to represent the shape of TERRAIN; unlike CONTOUR LINES, these are drawn without regard to a true vertical DATUM or regular vertical interval.
	1925	forward azimuth	See AZIMUTH: GEODETIC.
	1926	forward lap	See OVERLAP.
	1927	foul	(1) To entangle or become entangled; e.g. as a propeller becoming entangled in cables, nets, or seaweed. (2) To attach or come to lie on th... more (1) To entangle or become entangled; e.g. as a propeller becoming entangled in cables, nets, or seaweed. (2) To attach or come to lie on the surface of submerged objects, usually in large numbers or amounts as barnacles on the hull of a ship.
	1928	foul area	An area of numerous uncharted dangers to navigation. The area charted serves as a warning to the mariner that all dangers are not charted in... more An area of numerous uncharted dangers to navigation. The area charted serves as a warning to the mariner that all dangers are not charted individually and that navigation through the area may be hazardous. The term "foul" should not be applied to a soft continuum with indefinite boundaries such as mud or sand; to areas congested with marine vegetation such as kelp or grass in water; or to materials not likely to cause damage to a vessel.
	1929	foul berth	A berth in which a vessel cannot swing to her anchor or moorings without fouling another vessel or striking an obstruction.
	1930	foul bottom	A hard, uneven, rocky or obstructed BOTTOM having poor holding qualities for anchors, or one having ROCKS or WRECKAGE that would endanger an... more A hard, uneven, rocky or obstructed BOTTOM having poor holding qualities for anchors, or one having ROCKS or WRECKAGE that would endanger an anchored vessel.
	1931	foul ground	An area over which it is safe to navigate but which should be avoided for anchoring, taking the GROUND or GROUND fishing.
	1932	fouling	The mass of living and non-living bodies and particles attached to or lying on the surface of a submerged man-made or introduced object; mor... more The mass of living and non-living bodies and particles attached to or lying on the surface of a submerged man-made or introduced object; more commonly considered to be only the living or attached bodies.
	1933	fractional scale	See SCALE: NATURAL.
	1934	fracture zone	An extensive linear zone of irregular topography, mountainous or faulted, characterized by steep-sided or asymmetrical RIDGES, clefts, TROUG... more An extensive linear zone of irregular topography, mountainous or faulted, characterized by steep-sided or asymmetrical RIDGES, clefts, TROUGHS, or ESCARPMENTS.
	1935	frazil ice	Fine spicules or plates of ICE in suspension in water.
	1936	free-air anomaly	The difference between observed GRAVITY and theoretical GRAVITY which has been computed for LATITUDE and corrected for ELEVATION of the ST... more The difference between observed GRAVITY and theoretical GRAVITY which has been computed for LATITUDE and corrected for ELEVATION of the STATION above or below the GEOID, by application of the normal rate of change of GRAVITY for change of ELEVATION, as in free air. Also called Faye anomaly.
	1937	free atmosphere	See ATMOSPHERE.
	1938	free convection	See CONVECTION.
	1939	free gyroscope	See GYRO: FREE.
	1940	free port	A port where certain import and export duties are waived (unless goods pass into the country) to facilitate re-shipment to other countries.
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