Section 6    Target Tracking and AIS  6-28 
 
The symbol display is changed to " ". The target data will remain on the radar display until 
the target is lost and its vector disappears, or until another target is designated. 
If a target with the mark " " is designated, only its true bearing and range appear until its 
vector appears. 
 
 
Cancellation of numeric data display 
1  Set the cursor mode to the AUTO mode. 
2  Place the cursor on the tracked target to cancel numeric value display and then click 
on. 
The numeric value disappears. 
 
Details on tracked target information 
Item Explanation 
TT ID  ID No. of tracked target being displayed 
BRG True bearing 
Range Distance 
CTW (Course Through the 
Water stabilization mode)/ 
COG (Course Over the 
Ground stabilization mode) 
Course 
STW (Speed Through the 
Water stabilization mode) / 
SOG (Speed Over the 
Ground stabilization mode) 
Speed 
CPA  Closest approach distance 
TCPA  Time up to closest approach distance 
BCR  Bow crossing distance 
BCT  Bow crossing time 
 
 
6.5.4  Erasing unwanted tracked targets 
If the vectors and symbols of the unwanted tracked targets remain displayed, the radar screen may 
become difficult to view. In such a case, unwanted tracked targets can be erased from the radar screen 
using the following method. 
 
 
To erase one target 
1  Place the cursor on the tracked target to be cancelled and then right-click. 
The context menu is displayed. 
2  Click on the [Cancel TT] on the context menu. 
The vector symbol of the tracked target disappears and only the radar image remains.