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Appendix E - Glossary | 185

Appendix F - 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 eleva tion, etc. Almanac data is valid for 181 days.

ALTITUDE

The height of the antenna relative to the WGS-84 elipsoid and geoidal height.

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.

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

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.

AZIMUTH

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.

BAUD

Transmission rate unit of measurement for binary coded data (bit per second).

BEARING

The direction of one terrestrial point from another, expressed as angular distance

from North, clockwise through 360°.

BIT

Short form of Binary Digit. The smallest element of data in a binary-coded value.

bps

Bits Per Second.

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 199 200

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Memorex RX 1 Smart Manual de Instalação Página 187

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