3─44 
3 
3.5  BASIC OPERATIONS
y
y y
 
SHORT mode:  15 sec, 30 sec, 1 min, 3 min, 6 min, 10 min, 15 min, and CONT 
MID mode:  30 sec, 1 min, 3 min, 6 min, 10 min, 15 min, 30 min, and CONT 
LONG mode:  1 min, 3 min, 6 min, 10 min, 15 min, 30 min, 60 min, and CONT 
SUPER LONG mode:    30 min, 1 hr, 2 hr, 3 hr, 4 hr, 5 hr, 6 hr, 7 hr, 8 hr, 9 hr, 10 hr, 11 hr, 12 hr and 
CONT 
 
A trail length can also be changed by using the multi-function control.    (Refer to page 3-55.) 
 
Stored trails cannot be erased even when the trail lengths are changed by using [TRAILS] key.  Even 
after the trails display is turned off, the past trails can be displayed traced back by setting a desired time. 
The system is plotting trails even while the trails display is off. 
 
* Button
 
16
on the radar display on page 2-7 is also available to change trail length. 
 
Erasing Trails Data 
 
 
 Procedures   1  Hold down [TRAILS] key for 5 seconds. 
 
All the stored trails data will be erased.    The system starts plotting trails in initial state. 
When [TRAILS] key is pushed for 2 seconds, a RADAR Trails Setting menu will be 
displayed. Furthermore, data will be erased if it continues pushing. 
 
Trails Motion Mode 
 
There are two types of trails: relative motion trails and true motion trails. 
Relative motion trails:  The system plots the trails of a target at a position relative to the own ship. 
  The operator can easily judge whether the target is approaching the own 
ship. 
  While the own ship is moving, the system also plots the trails of land and 
other fixed targets. 
True motion trails:  The system plots the absolute motion trails of a target, irrespective of the 
own ship’s position. 
  The operator can easily judge the course and speed of the target. 
  The system does not plot the trails of land and other fixed targets. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Land 
Ship
Trails
Land 
Ship
Trails 
True Motion Trails
Relative Motion Trails