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Eng ID | Term | Definition |
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1921 | foresight | In LEVELLING, a reading on a LEVELLING ROD held on a point whose ELEVATION is to be determined. See also BACKSIGHT. |
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1922 | format | The general plan or arrangement of a product. Specification of succession and type of representation of elements of information (numbers, t... more |
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1923 | formation sounding | See SOUNDING. |
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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 |
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1925 | forward azimuth | See AZIMUTH: GEODETIC. |
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1926 | forward lap | See OVERLAP. |
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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 |
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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 |
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1929 | foul berth | A berth in which a vessel cannot swing to her anchor or moorings without fouling another vessel or striking an obstruction. |
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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 |
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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. |
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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 |
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1933 | fractional scale | See SCALE: NATURAL. |
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1934 | fracture zone | An extensive linear zone of irregular topography, mountainous or faulted, characterized by steep-sided or asymmetrical RIDGES, clefts, TROUG... more |
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1935 | frazil ice | Fine spicules or plates of ICE in suspension in water. |
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1936 | free-air anomaly | The difference between observed GRAVITY and theoretical GRAVITY which has been computed for LATITUDE and corrected for ELEVATION of the STA... more |
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1937 | free atmosphere | See ATMOSPHERE. |
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1938 | free convection | See CONVECTION. |
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1939 | free gyroscope | See GYRO: FREE. |
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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. |