5.2    TT OPERATION 
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5.2.3    Tracking Target Data Display [TGT DATA] 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Type of Data Display 
 
Target Data 
Target identification (TT ID)  ID number of the target 
True bearing: BEARING 
0.1q unit 
Range: RANGE  0.01 NM unit 
True course: COURSE 
0.1q unit 
True speed: SPEED  0.1 knot unit 
Closest point of approach (CPA)  0.01 NM unit 
Time to CPA (TCPA)  0.1 min unit 
Bow crossing range (BCR)  0.01 NM unit 
Bow crossing time (BCT)  0.1 min unit 
 
 
The target for which its numeric data is displayed is marked with a symbol “
 
” to distinguish from other 
targets. 
If a target’s data is displayed, but without the symbol “
 
”,  such  a  target  exists  outside  the  currently 
displayed radar display. 
 
 
 
 
z  When a target or own ship changes its course, or when a new 
target is acquired, its vector may not reach a given level of 
accuracy until three minutes or more has passed after such 
course change or target acquisition. 
Even if three minutes or more has passed, the vector may 
include an error depending upon the. tracking conditions. 
Attention