6-11  Section 6 Target Tracking and AIS 
 
 
 
 
 
 
Symbol  Definition  Remarks 
 
AIS coastal base 
station   
Displayed by the same colour as AIS symbol. 
 
Numerical display AIS 
coastal base station 
When the numeric data is displayed, the target 
symbol is enclosed in a square. 
 
Lost AIS coastal base 
station 
The alarm sounds. 
The alarm message (Lost) turns orange and 
blinks. 
The symbol is displayed by overlaying red x 
marks. 
 
Memo 
The AIS-SART target symbol is displayed in red when the target is activated. 
 
 
6.3.4  About AIS AtoN (Aids to Navigation) 
AIS AtoN is a system that displaying aid to navigation like a lighthouse, light buoy or unreal aid to 
navigation on the display unit on ships using AIS receiver. 
There are following two kinds of AIS AtoN. 
 
 
 
 
Physical AIS 
AtoN 
Installs the AIS on real aid to 
navigation, and displays its location 
on the display unit on ships. 
In low visibility, receiving the Physical AIS 
AtoN symbols facilitates identification of 
the light location and light buoy. 
Virtual AIS AtoN  Displays virtual aid to navigation on 
the display unit on ships according 
to the signals transmitted from the 
AIS station on the land. 
In the sea area where installation of the 
light buoy is difficult, the Virtual AIS AtoN 
symbols are displayed as virtual light 
buoys that are used as targets for getting 
to the destination. 
This system can also be used as the aid 
substituted for the aid to navigation 
damaged by natural disasters.
 
 
6.3.5  About AIS-SART Information 
The AIS-SART function enables information about the location of wrecked ship to be displayed on the 
screen. 
For the details, refer to "7.6 Display of AIS-SART".