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Glossary
TRUE WIND ANGLE (TWA)
TRUE WIND DIRECTION (TWD)
TRUE WIND SPEED (TWS)
UNCERTAINTY
UNIVERSAL TIME COORDINATED (UTC)
UPDATE
UTC
UTM
UNIVERSAL TRANSVERSE MERCATOR
VDL
VDOP (Vertical Dilution of Precision)
Version 2.0
Similar to APPARENT WIND ANGLE, but compensated for the
motion of the vessel. TWA and AWA are equal if the vessel is not
moving.
The direction of the wind over ground, expressed as an angular
distance from north clockwise through 360°.
The wind speed relative to either ground or water rather than to the
moving vessel.
In the navigator, an indication of the expected accuracy expressed
as the radius of a circle around the calculated (displayed) position.
The uncertainty is expressed in meters or feet. The calculation of
uncertainty is based on the HDOP value.
Greenwich mean time corrected for polar motion of the Earth and
seasonal variation in the Earth's rotation.
See POSITION UPDATE.
See UNIVERSAL TIME COORDINATED.
See UNIVERSAL TRANSVERSE MERCATOR.
Alternative grid system used in harbor areas and for land applica-
tions instead of latitude and longitude.
VHF Data Link.
An indicator of the accuracy in altitude. See DILUTION OF POSI-
TION.
Operator's Manual
213
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