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	Eng ID	Term	Definition
	1581	electric submerged log	See LOG.
	1582	electromagnetic distance measurement (EDM)	Any process or technique of distance measurement which depends on a comparison of SIGNALS by electromagnetic means.
	1583	electromagnetic log	See LOG.
	1584	electromagnetic position fixing	Any process or technique of fixing which employs the properties of electromagnetic waves.
	1585	electromagnetic wave	See WAVE.
	1586	electrometeor	Visible or audible manifestation of atmospheric electricity, either corresponding to discontinuous electrical discharges (LIGHTNING, THUNDER... more Visible or audible manifestation of atmospheric electricity, either corresponding to discontinuous electrical discharges (LIGHTNING, THUNDER) or occurring as more or less continuous PHENOMENA (SAINT ELMO'S FIRE, POLAR AURORA).
	1587	electronic chart	A very broad term to describe the DATA, the SOFTWARE, and sometimes the electronic system, capable of displaying CHART information.
	1588	Electronic chart display and information system (ECDIS)	The navigation information system which is considered the legal equivalent of the nautical chart, displaying selected information from an e... more The navigation information system which is considered the legal equivalent of the nautical chart, displaying selected information from an electronic navigation chart (ENC) integrated with data from positional and, optionally, other sensors.
	1589	electronic data processing	In a COMPUTER, data processing performed largely or exclusively on electronic equipment.
	1590	electronic distance-measuring equipment (EDM)	Devices that measure the phase difference between transmitted and returned (i.e. reflected or retransmitted) ELECTROMAGNETIC WAVES, of known... more Devices that measure the phase difference between transmitted and returned (i.e. reflected or retransmitted) ELECTROMAGNETIC WAVES, of known FREQUENCY and SPEED, or the round-trip transit time of a pulsed SIGNAL, from which distance is computed. A wide range of such equipment is available for surveying and navigational use. Also called distance measuring equipment (DME).
	1591	electronic line of position	A LINE OF POSITION established by means of electronic equipment.
	1592	electronic navigation	See NAVIGATION.
	1593	electronic navigation station	See STATION.
	1594	electronic navigational chart (ENC)	1. An electronic navigational chart is a subset of the electronic chart data base held on the vessel. It contains information on features us... more 1. An electronic navigational chart is a subset of the electronic chart data base held on the vessel. It contains information on features useful for navigation such as coastline, obstructions, beacons etc. 2. The digital data base that is intended to be used in conjunction with ECDIS. Standardized as to content, structure and format the ENC may contain supplementary nautical information useful for safe navigation. The ENC is a subset of the master data base of chart information.
	1595	electronic plotting sheet	See PLOTTING SHEET.
	1596	electronic telemeter	See TELEMETER.
	1597	electro-optical distance measurement (EODM)	Any method of electromagnetic distance measurement based on a comparison of light signals.
	1598	electrostriction	Term applied to the creation of elastic tension and changes of shape and volume of an uncharged isolator by an electrical field.
	1599	electrotape	A trade name for a precise electronic distance measuring device operating on the same principle as the Tellurometer. Originally designated a... more A trade name for a precise electronic distance measuring device operating on the same principle as the Tellurometer. Originally designated as micro-dist.
	1600	elevated pole	See POLE.
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