JRC JMA-932B-SA User Manual page 248

About AIS AtoN(Aids to Navigation)
AIS AtoN is a system that displaying aid to navigation like a beacon, light buoy or unreal aid to navigation on the
display unit on ships using AIS receiver.
There are two kind of AIS AtoN.
① Real AIS AtoN
Setting up AIS on the aid to navigation, and then it displays their position on display unit on other ships.
Operation example: At the time of low visibility, receiving Real AIS AtoN symbol facilitates identification of
light buoy or confirming of beacon's position.
② Virtual AIS AtoN
It displays unreal aid to navigation on display unit on other ships using a signal from land-based AIS.
Operation example: It displays the Virtual AIS AtoN symbol as a virtual light buoy in marine area that is difficult
to setup light buoy, and then regarding their symbol as a mark to voyage.
Or it uses it as an alternate navigation at the time of disaster.
Note: When displaying AIS-SART symbols, the Display Unit is needed to the installed software more
than Ver. 01.01.
For confirmation method for the Display Unit software version, see the section "8.4.1 Check Performance
on Test Menu".
For AIS-SART details, see the section "6.6 DISPLAY OF AIS-SART".
Up to 300 targets can be displayed in total of activated and sleeping AIS targets. Up to 100 activated AIS targets
can be included in the total.
If there are more AIS targets than the allowable maximum, they are displayed in the following priority order:
1. Numeric displayed target
2. Target of which CPA / TCPA is lower than the set value
(Target as a dangerous ship for which an alarm has occurred)
3. Target in automatic activation zone
4. Activated AIS target
5. Target inside AIS filter
6. Target outside AIS filter
If the number of targets at the same priority level exceeds the allowable maximum, they are displayed in the
following priority order:
1. Association target
2. Activated AIS target
3. Sleeping AIS target
The vector of an AIS target is to be displayed with a vector over ground or over water, depending on the speed
sensor setting and current offset setting. The type of the currently displayed vector can be confirmed by viewing
the setting of the stable mode.
When GND is displayed for the stability mode (upper left of the display on page 2-2):
Vector over ground
When Sea is displayed for the stability mode (upper left of the display on page 2-2):
Vector over water
When the vector of an AIS target is displayed with a vector over water, the system has converted the AIS
target's vector over ground to the vector over water according to the data received from the AIS and the own
ship's information.
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