Section 13 Setting up the Operation Mode  13-10 
13.6  Setting Radar Trail Mask 
 
Radar trail mask 
If radar trails of unnecessary targets are not drawn on the radar trail of target you want to focus on, 
you can leave the radar trail you want to pay attention to. By specifying a target, that radar trail will 
be masked and will not be drawn. 
The target that can mask the radar trail is up to four tracking targets and the associated AIS 
targets. If an unassociated AIS target is specified, acquire the target and mask the radar trail. If a 
sleeping AIS target is specified, activate and acquire the target and mask the radar trail. 
 
Memo 
The following targets can not be associated, so they are not targeted for the radar trail mask. 
•  AIS AtoN 
•  AIS SAR aircraft 
•  AIS coastal base station 
•  Initial acquisition target 
 
The area of radar trail mask can be displayed and extended. However, if the mask area is 
excessively extended, a radar trail of target passing nearby is not drawn. 
 
 
 
Set a radar trail mask function. 
[Operation procedure] 
Open the radar trail mask setting screen by performing the following menu operations. 
[Menu] button → Settings → Trails Masking 
 
   
1
2
3
4
TT symbol
Vector
Radar echo
Radar trail
Own ship position
Mask area of 
radar trail
A radar trail is 
not drawn after 
the mask area is 
set.