Assigned Mode
A transponder operates in an assigned mode if it is in-
structed 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.
AUX
Auxiliary Port – A communication port on the AIS tran-
sponder, 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.
CENTRAL MERIDIAN
The meridian (see MERIDIAN) that passes through the
center of the referenced grid (Zero longitude).
CHARACTER STRING
Contiguous characters (other than spaces) in a message.
CHECKSUM
The value sent with a binary-coded message to be
checked at the receiving end to verify the integrity of the
message.
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