Section 6 Target Tracking and AIS  6-10 
 
Symbol  Definition  Remarks 
   
Virtual AIS AtoN target 
(Safe water) 
The target No./AtoN name (xxx) is displayed 
next to the symbol. 
   
Virtual AIS AtoN target 
(Special mark) 
The target No./AtoN name (xxx) is displayed 
next to the symbol. 
 
Virtual AIS AtoN target 
(Numerical display)   
When the numeric data is displayed, the 
target symbol is enclosed in a square. 
 
Virtual AIS AtoN target 
(Lost display)   
The alarm sounds. 
The alarm message (Lost) turns orange and 
blinks. The symbol is displayed by overlaying 
red x marks. 
 
Virtual AIS AtoN target 
(Intended location of 
missing AtoN) 
"Missing" is displayed in yellow at the top of 
the symbol. The target No./AtoN name (xxx) is 
displayed nearby the symbol. 
 
AIS SAR aircraft  Displayed by the same colour as AIS symbol. 
 
Numerical display AIS 
SAR aircraft   
When the numeric data is displayed, the 
target symbol is enclosed in a square. 
 
Lost AIS SAR aircraft 
The alarm sounds. 
The alarm message (Lost) turns orange and 
blinks. The symbol is displayed by overlaying 
red x marks. 
 
AIS SAR ship  Displayed by the same colour as AIS symbol. 
 
Numerical display AIS 
SAR ship 
When the numeric data is displayed, the 
target symbol is enclosed in a square. 
 
Lost numerical display 
AIS SAR ship 
The alarm sounds. 
The alarm message (Lost) turns orange and 
blinks. The symbol is displayed by overlaying 
red x marks.