5.1    PREPARATION 
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5.1.2    Definitions of Symbols 
 
 
Types and Definitions of Target Tracking Symbols 
 
Vector/Symbol  Definition  Remarks 
 
 
 
Initial acquisition target 
This symbol is displayed until the vector is displayed after 
target acquisition. 
 
Target acquired in 
automatic acquisition zone 
The alarm sounds. 
The alarm message (New Target) turns red and blinks. 
The symbol is red colored. 
 
 
 
Tracked target     
 
Dangerous target 
The alarm sounds. 
The alarm message (CPA/TCPA) turns red and blinks. 
The symbol is turns red, and indicates with X mark. 
 
 
 
 
Numeric displayed target   
When the numeric data is displayed, the target symbol is 
enclosed in a square.   
 
 
 
 
Lost target 
The alarm sounds. 
The alarm message (Lost) turns red and blinks. 
The symbol is turns red, and indicates with X mark. 
 
Past position 
The past positions of an AIS target are displayed as well as 
the target tracking symbol. 
 
 
 
 
 
Target track 
The track of another ship as an AIS target is displayed as 
well as the target tracking symbol.   
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