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Eng ID Term Definition
3401
navigability
Of a vessel: capability of being con­trolled and steered. Of a water area: capabil­ity of being navigated.
3402
navigable
(adj.). Affording passage to a craft; capable of being navigated.
3403
navigable area surveys (NAS)
Navigable Area Surveys are basic hydrographic surveys with restricted area coverage. The coverage is reduced by omitting require­ments for:... more
Navigable Area Surveys are basic hydrographic surveys with restricted area coverage. The coverage is reduced by omitting require­ments for: 1. Development of the 0‑foot depth curve and foul, nearshore areas not considered navigable; 2. Complete field edit of the survey area. Naviga­ble Area Surveys may also be restricted to the main navigable channel or corridor.
3404
navigable semicircle
See DANGEROUS SEMICIRCLE.
3405
navigable waters
Waters usable, with or without impro­vements, as routes for commerce in the customary means of travel on water.
3406
navigation
The process of directing the movement of a craft from one point to another.
3407
navigation mark
An artificial or natural object of easily recognisable shape or colour, or both, situated in such a POSITION that it may be identified on a ... more
An artificial or natural object of easily recognisable shape or colour, or both, situated in such a POSITION that it may be identified on a CHART or related to a known navigational instruction.  Alternative term for visual AID TO NAVIGATION.  Includes both BUOYs and BEACONs (fixed artificial navigation mark).
3408
navigation: acoustic
See NAVIGATION: SONIC.
3409
navigation: aerial
See NAVIGATION: AIR.
3410
navigation: air
The NAVIGATION of aircraft. Occasionally called aerial navigation or navigation. See NAVIGATION: SURFACE.
3411
navigation: astro
See NAVIGATION: CELESTIAL.
3412
navigation: celestial
NAVIGATION with the aid of CELE­STIAL BODIES. Also called astro-navigation.
3413
navigation: coastwise
NAVIGATION in the vicinity of a COAST, in contrast with OFFSHORE NAVIGATION.
3414
navigation: Doppler
NAVIGA­TION using equipment employ­ing Doppler shift measurement techniques with respect to transmitted and reflected SIGNALS to automatic... more
NAVIGA­TION using equipment employ­ing Doppler shift measurement techniques with respect to transmitted and reflected SIGNALS to automatically compute DRIFT ANGLE and GROUND SPEED. DRIFT ANGLE and GROUND SPEED are used in DEAD RECKONING performed either manually or, as in many installations, by dead reckoning COMPUTERS. In either case, craft HEADING is a necessary INPUT.
3415
navigation: electronic
NAVIGATION by means of electronic equipment. The expression 'electronic navigation' is more inclusive than radio navigation, since it includ... more
NAVIGATION by means of electronic equipment. The expression 'electronic navigation' is more inclusive than radio navigation, since it includes navigation involving any electronic device or instrument.
3416
navigation: grid
NAVIGATION by the use of GRID DIREC­TIONS.
3417
navigation: hyperbolic
NAVIGATION by the use of HYPER­BOLIC LINES OF POSITION.
3418
navigation: inertial
DEAD RECKONING performed automa­ti­cally by a device which gives a continuous indicati­on of POSITION by double integra­tion of ACCELERA... more
DEAD RECKONING performed automa­ti­cally by a device which gives a continuous indicati­on of POSITION by double integra­tion of ACCELERATION since leaving a starting point.
3419
navigation: land
NAVIGATION of vehicles across LAND or ICE. The expression is generally used in connection with the crossing of a region devoid of roads or L... more
NAVIGATION of vehicles across LAND or ICE. The expression is generally used in connection with the crossing of a region devoid of roads or LAND­MARKS, so that methods similar to those employed in AIR or MARINE NAVIGATION must be employed.
3420
navigation: long range
NAVIGATION requiring only aids usable at long RANGE, relatively few of which could provide world coverage. The opposite is SHORT RANGE NAVIG... more
NAVIGATION requiring only aids usable at long RANGE, relatively few of which could provide world coverage. The opposite is SHORT RANGE NAVIGATION.