MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series Chapter 6
Using The Menu
Operation Manual
93142122-07
6-35
WARNING: The accuracy of the data provided by the AIS could be affected by the
following
factors:
Degraded bearing and speed data fed from external sensor devices cause erratic
vectors. If any error data fed from external sensor devices are detected, the following data
provided by the AIS display will be also erratic.
(1) The CPA and TCPA value and Alarm.
(2) The target ship’s course and speed.
(3)
The target ship’s bearing and distance.
6.8.4 AIS target symbols
According to the AIS operational status, the following target symbols are used.
Activated Target
A target, which the AIS user has activated is termed “Activated Target” and is supplied
with an ID number (1 to 64). The vector time and mode are determined with the
settings being made for the radar plotting function.
Sleeping Target
A target, which is not activated by the AIS user is termed “Sleeping Target.” The target
has no ID, vectors or ROT information, only showing the presence of a vessel with AIS
equipped.
Selected Target
A target selected by the AIS user is termed “Selected Target”. Once selected, a
dashed square is drawn around the target and AIS data (MMSI, CPA, TCPA, COG,
Figure 6.10 Sleeping Target Symbol
The target turning to the starboard
Figure 6.9 Activated Target Symbol
AIS vector
(speed and course
over ground)
Heading Direction
(fixed length)
12
12
Rate Of Turn Indicator
Target number
