Echo Trails
The echo trails feature enables you to track the movement of vessels on the radar display. As a vessel moves, you can see a faint trail 
of the vessel's wake. You can change the length of time the trail is displayed.
NOTE:
Depending upon the radar in use, the settings configured for use in one radar mode may or may not be applied to other radar modes or to the radar overlay.
NOTE:
This feature is not available on
xHD open array or
HD/HD+ radome models.