number is permanently assigned to each ship and may
be used to find additional registration information for
a particular vessel.
HDG /
Heading
The course a vessel is steering.
MMSI
Maritime Mobile Service Identification. Used as a
radio identifier for each vessel with digital radios
such as an AIS transponder. Vessels may also
transmit their name to facilitate easier identification.
These transmissions occur at a different interval than
position information and as a result the name may not
be immediately available. In this case, the MMSI
number is used to identify a vessel.
Profile
A group of settings. Profiles allow you to organize
filter and alarm settings and activate them together
when your navigation situation changes.
RNG /
Range
The distance in nautical miles between two vessels.
ROT
Rate of turn. The number of degrees a vessel is
turning over a specified amount of time. Usually per
minute but may also be per 30 seconds.
SOG
Speed over ground. The actual speed in knots a vessel
is making over the ground.
Target
Another vessel for which AIS information has been
received.
Target List
The set of all targets which meet the filter
requirements.
TCPA
The time until the closest point of approach.
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