Chapter 6 MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Using The Menu
Operation Manual
6-34
93142122-07
(2) Select and set LIM (AIS range) In the RADAR menu. The AIS sleeping target
symbols will be displayed on the screen within the LIM range. The LIM range
can be set up to 20NM as maximum range.
(3) The AIS symbols are displayed on the target echoes or separated on reported
position. The AIS interface can handle up to 64 targets for AIS processing. The
exceeding the limit numbers of target cause the alarm message “Number of
targets have exceeded the limit” shown on the screen.
(4) To prevent potential dangerous targets from being unprocessed, always keep the
LIM range to allow a total number of AIS targets to be within 64.
(5) To view the AIS data of a specific target, set the cursor with the joystick on to the
sleeping target symbol and press ENT key to change it to an activated target
symbol. Then, set the target ID number in the RADAR menu to an associated
TARGET ID shown on the screen.
6.8.3 AIS data display
TARGET ID
Target ID for Data Indication
MMSI
An acronym of “Maritime Mobile Service Identity”, which
means the identification number of each ship that carries the
AIS transponder. The number is assigned by the IMO.
CPA
Closest Point of Approach
TCPA
Time to CPA
CSE/COG
Course/Course Over Ground
STW/SOG
Speed through Water/Speed Over Ground
RNG
Range
T BRG
True
Bearing
The TARGET ID is applied from 1 to 64 automatically. When a target has moved out of
LIM range or been lost, the ID number being used will be applied to other newly
selected target automatically.
In case of uncertainty of CPA/TCPA calculation ( e.g. AIS SOG/COG not available)
the AIS data field is marked with xxx.x.
In case of own ship data missing (e.g. VTG, VBW) the AIS data field is left blank and
an alarm “NO OWN DATA“ is generated.
