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Total record count: 6269.

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Eng ID Term Definition
5861
vertical parallax
See PARALLAX: Y-.
5862
vertical photograph
See PHOTOGRAPH.
5863
vertical plane
See PLANE.
5864
very close pack ice
SEA ICE the CONCENTRATION of which is practically 10/10ths with little if any water present.
5865
very high frequency (VHF)
See FREQUENCY: RADIO.
5866
very low frequency (VLF)
See FREQUENCY: RADIO.
5867
very open pack ice
SEA ICE the CONCENTRATION of which ranges between 1/10ths 3/10ths.
5868
vessel traffic service (VTS)
Any service implemented by a relevant authority primarily designed to improve safety and efficiency of traffic flow and the protec­tion of t... more
Any service implemented by a relevant authority primarily designed to improve safety and efficiency of traffic flow and the protec­tion of the environment. It may range from simple information messages, to extensive organization of the traffic involving national or regional schemes.
5869
viaduct
A structure consisting of a series of arches or towers supporting a roadway, waterway, etc., across a depression, etc.
5870
vibrating needle
A MAGNETIC NEEDLE used in compass adjustment to find the relative intensity of the horizontal components of the EARTH'S MAGNETIC FIELD and t... more
A MAGNETIC NEEDLE used in compass adjustment to find the relative intensity of the horizontal components of the EARTH'S MAGNETIC FIELD and the MAGNETIC FIELD at the compass location. Also called horizontal force instrument. See COMPENSATION OF MAGNE­TIC COMPASS.
5871
vibration
Periodic motion of an elastic body or medium in alternately opposite directions from EQUILI­BRIUM; OSCILLATION. The motion of a vibrating bo... more
Periodic motion of an elastic body or medium in alternately opposite directions from EQUILI­BRIUM; OSCILLATION. The motion of a vibrating body during one complete CYCLE; two OSCILLATIONS.
5872
vigia
A PINNACLE, ROCK, or SHOAL the existence or POSITION of which is doubt­ful, or a warning note to this effect on a CHART.
5873
vignetting
In PHOTOGRAPHY, a gradual reduction in DENSITY of parts of a photographic IMAGE due to the stopping of some of the RAYS entering the LENS.
5874
violent storm
WIND with a speed between 56 and 63 KNOTS (Beaufort scale wind force 11).
5875
virtual image
See IMAGE.
5876
visibility
The extreme horizontal distance at which prominent objects can be seen and identified by the unaided eye.
5877
visibility: flight
The VISIBILITY forward from the cockpit of an aircraft in flight.
5878
visibility: meteorological
The greatest distance at which a black object of suitable dimensions can be seen and recognized against the horizon sky, or, in the case of ... more
The greatest distance at which a black object of suitable dimensions can be seen and recognized against the horizon sky, or, in the case of night observations, could be seen and recognized if the general illumination were raised to the normal daylight level.
5879
visibility: radius of
The radius of a circle limiting the area in which an object can be seen under speci­fied conditions.
5880
visible horizon
See HORIZON: APPARENT.