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Glossary
Glossary
AIS - Automatic Identification System.
ALARM
ALMANAC
ALTITUDE
AMBIENT
ANTENNA HEIGHT
ATMOSPHERIC PRESSURE
APPARENT WIND ANGLE (AWA)
APPARENT WIND SPEED (AWS)
Version 2.0
A shipboard broadcast transponder system in which ships
continually transmit their ID, position, course, speed and other
data to other nearby ships and shoreline authorities on a
common VHF radio channel.
Message by which the navigator signals the occurrence of an event.
The alarm is indicated by an audible tone and/or a message (or
icon) on the display.
Library of coarse satellite orbital characteristics used to calculate
satellite rise times, set times, angles of elevation, etc. Almanac data
is valid for 181 days.
The height of the antenna over mean sea level.
Surrounding or encompassing environment.
The height (over the waterline) in which the antenna is installed.
This value is used in 2D mode only.
See BAROMETRIC PRESSURE.
The angle of the wind as measured on the moving vessel relative to
the heading of the vessel. An AWA of 0° indicates a wind from
straight ahead, whereas 180° indicates a wind from straight astern.
An AWA of 90° indicates a wind perpendicular to the vessel from
its starboard side.
The speed of the wind as measured on the moving vessel.
Operator's Manual
195
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