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Eng ID Term Definition
3381
name
The label of a numerical value used par­ticularly to refer to the N (north) or S (south) label of LATI­TUDE and DECLINATION. When LATITUDE a... more
The label of a numerical value used par­ticularly to refer to the N (north) or S (south) label of LATI­TUDE and DECLINATION. When LATITUDE and DECLINATION are both N or both S, they are said to be of the same name, but if one is N and the other S, they are said to be of contrary name.
3382
nanosecond
A thousand millionth of a SECOND.
3383
Nansen bottle
A device used by oceanographers to obtain subsurface samples of SEA WATER. The bottle is lowered by wire; its valves are open at both ends. ... more
A device used by oceanographers to obtain subsurface samples of SEA WATER. The bottle is lowered by wire; its valves are open at both ends. It is then closed 'in situ' by allowing a weight (called a MESSENGER) to slide down the wire and strike the rever­sing mecha­nism. This causes the bottle to turn upside down, closing the valves and reversing the REVERSING THERMOMETERS which are mounted in a special thermometer case on it. If, as is usually done, a series of bottles is lowered, then the reversal of each bottle releases another MESSENGER to actuate the bottle beneath it.
3384
Napier's (or Napier) diagram
A DIAGRAM on which com­pass deviation is plotted for various HEADINGS, and the points connected by a smooth curve, permitting a ready conver... more
A DIAGRAM on which com­pass deviation is plotted for various HEADINGS, and the points connected by a smooth curve, permitting a ready conversion of deviations from compass to magne­tic HEADINGS, or vice versa.
3385
narrow-beam echo sounder
A sounder with a transducer of small aperture (typically 2° to 5°) required for high resolution mapping.
3386
narrows
A NAVIGABLE narrow part of a BAY, STRAIT, RIVER, etc.
3387
natural frequency
See FREQUENCY.
3388
natural scale
See SCALE.
3389
natural year
See YEAR: TROPICAL.
3390
nature of the bottom
See BOTTOM: NATURE OF.
3391
nautical
(adj.). Of or pertaining to ships, NAVIGATION (chiefly marine) or seamen. In contrast, navigational refers to NAVIGATION only.
3392
nautical almanac
See ALMANAC.
3393
nautical astronomy
See ASTRONOMY.
3394
nautical chart
A CHART specifically designed to meet the requirements of MARINE NAVIGATION, showing DEPTHS of water, NATURE OF BOTTOM, ELEVATIONS, configur... more
A CHART specifically designed to meet the requirements of MARINE NAVIGATION, showing DEPTHS of water, NATURE OF BOTTOM, ELEVATIONS, configuration and characteristics of COAST, dangers and AIDS TO NAVIGATION. May be a paper chart, electronic navigational chart (ENC) or a raster navigational chart (RNC). Also called marine chart, hydrographic chart, or simply CHART. - 2. (From SOLAS Chapter V) A special-purpose MAP or a specially compiled database from which a MAP is derived, that is issued officially by or on the authority of a Government, authorized Hydrographic Office or other relevant government institution and is designed to meet the requirements of MARINE NAVIGATION.
3395
nautical mile
A unit of length used principally in NAVIGATION. See INTERNATION­AL NAUTICAL MILE.
3396
nautical plan
A large scale nautical chart or a large scale inset of a nautical chart.
3397
nautical twilight
See TWILIGHT.
3398
nautophone
A HORN having a diaphragm oscillated by electricity.
3399
NAVAREA
The short title for a geographical sea area (may include inland seas, lakes and waterways navigable by sea-going ships) established for the ... more
The short title for a geographical sea area (may include inland seas, lakes and waterways navigable by sea-going ships) established for the purpose of coordinating the broadcast of navigational warnings. The term NAVAREA followed by a roman numeral may be used to identify a particular sea area. The delimitation of such areas is not related to and shall not prejudice the delimitation of any boundaries between States.
3400
NAVAREA warning
a NAVIGATIONAL WARNING or in-force bulletin promulgated as part of a numbered series by a NAVAREA Co-ordinator.