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	Eng ID	Term	Definition
	1781	false target	See ECHO: FALSE.
	1782	fan	A relatively smooth, fan-like depositional feature normally sloping away from the outer termination of a CANYON or canyon system. Also cal... more A relatively smooth, fan-like depositional feature normally sloping away from the outer termination of a CANYON or canyon system. Also called CONE.
	1783	farad	The unit of electrical capacitance, in the SI SYSTEM.
	1784	farewell buoy	The outermost BUOY marking the ENTRANCE to a CHANNEL or HARBOUR. Also called sea buoy. Known as landfall buoy in British terminology.
	1785	fast ice	SEA ICE which remains fast, generally in the position where originally formed, and which may attain a considerable thickness. It is found al... more SEA ICE which remains fast, generally in the position where originally formed, and which may attain a considerable thickness. It is found along COASTS, where it is attached to the SHORE, or over SHOALS, where it may be held in position by ISLANDS, grounded ICEBERGS or grounded polar ice.
	1786	fata morgana	The name originally given to a multiple mirage phenomenon often observed over the Straits of Messina, and supposed to be the work of the f... more The name originally given to a multiple mirage phenomenon often observed over the Straits of Messina, and supposed to be the work of the faity (in Italian: fata) Morgana; later, it was applied to any impressive multiple MIRAGE.
	1787	fathogram	A graphic record of depth measurements obtained by a fathometer (erroneously applied to any ECHOGRAM).
	1788	fathom	A unit of length equal to 6 FEET or 1.83 METRES.
	1789	fathom curve	See FATHOM LINE, DEPTH CURVE.
	1790	fathom line	A DEPTH CURVE with DEPTH expressed in FATHOMS. Also called fathom curve, isobath.
	1791	fault	In GEOLOGY, a break of shear in the EARTH's CRUST with an observable displacement between the two sides of the break, and parallel to the ... more In GEOLOGY, a break of shear in the EARTH's CRUST with an observable displacement between the two sides of the break, and parallel to the plane of the break.
	1792	Faye anomaly	See FREE-AIR ANOMALY.
	1793	feature code	An alphanumeric code (label) attached to all point, line or area data describing a cartographic feature of particular quality.
	1794	Federation of Astronomical and Geophysical Services (FAGS)	Facilitates and promotes the collection of observations, information and statistics in the field of astronomical and geophysical sciences. T... more Facilitates and promotes the collection of observations, information and statistics in the field of astronomical and geophysical sciences. The International Time Bureau is one of the services.
	1795	fender	A device let down between the side of a ship or a WHARF or other ship to protect from chafing when ships are lying alongside or to take the ... more A device let down between the side of a ship or a WHARF or other ship to protect from chafing when ships are lying alongside or to take the shock of a bump when going alongside.
	1796	fetch	An area of the sea surface over which SEAS are generated by a WIND having a constant direction and SPEED. The length of the generating area,... more An area of the sea surface over which SEAS are generated by a WIND having a constant direction and SPEED. The length of the generating area, measured in the direction of the WIND in which the SEAS are generated.
	1797	fiducial axes	In PHOTOGRAMMETRY, the lines joining opposite FIDUCIAL MARKS on a PHOTOGRAPH. Also called photograph axes.
	1798	fiducial marks	In PHOTOGRAMMETRY, INDEX MARKS, usually four, which are rigidly connected with the camera lens through the camera body and which form IM... more In PHOTOGRAMMETRY, INDEX MARKS, usually four, which are rigidly connected with the camera lens through the camera body and which form IMAGES on the NEGATIVE and usually define the PRINCIPAL POINT of the PHOTOGRAPH. Also marks, usually four in number, in any instrument, which define the axes whose intersection fixes the PRINCIPAL POINT of a PHOTOGRAPH and fulfills the requirements of INTERIOR ORIENTATION. In SURVEYING, an index line or point. A line or point used as a basis of reference.
	1799	field board	(British terminology). Wooden board, or zinc or plastic sheet, used by HYDROGRAPHERS and land surveyors for plotting and recording the detai... more (British terminology). Wooden board, or zinc or plastic sheet, used by HYDROGRAPHERS and land surveyors for plotting and recording the details of the SURVEY in the field. Separate boards are usually prepared for TOPOGRAPHY and SOUNDING respectively. The former are referred to as topography boards; the latter as sounding boards. See also BOAT SHEET, and PLANE TABLE.
	1800	field chart	See CHART.
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