Version 2.0
195
Glossary
Operator’s Manual
Glossary
AIS - Automatic Identification System.
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.
ALARM
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.
ALMANAC
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.
ALTITUDE
The height of the antenna over mean sea level.
AMBIENT
Surrounding or encompassing environment.
ANTENNA HEIGHT
The height (over the waterline) in which the antenna is installed.
This value is used in 2D mode only.
ATMOSPHERIC PRESSURE
See BAROMETRIC PRESSURE.
APPARENT WIND ANGLE (AWA)
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.
APPARENT WIND SPEED (AWS)
The speed of the wind as measured on the moving vessel.
Summary of Contents for MX420
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