MX510/MX512 Operator & Installation Manual - Simrad Professional ...

Appendix F - Glossary
AIS - Automatic Identification System.
ALARM
ALMANAC
ALTITUDE
AMBIENT
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 eleva tion, etc. Almanac data is valid for 181 days.
The height of the antenna relative to the WGS-84 elipsoid and geoidal height.
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.
Assigned Mode
A transponder operates in an assigned mode if it is instructed by an external
system to follow certain dictated rules, such as, which slots to use for
transmission.
Autonomous Mode
AUX
AZIMUTH
BAUD
BEARING
BIT
bps
A transponder operates autonomously if it is independent of external control.
Auxiliary Port – A communication port on the AIS transponder, which can be used
for NMEA or RTCM, input.
In satellite navigation, the angular distance measured on the horizon circle in a
clockwise direction from the north point in the horizon to the satellite point in the
horizon.
Transmission rate unit of measurement for binary coded data (bit per second).
The direction of one terrestrial point from another, expressed as angular distance
from North, clockwise through 360°.
Short form of Binary Digit. The smallest element of data in a binary-coded value.
Bits Per Second.
Appendix E - Glossary | 185