Lowrance electronic lra-1800 Manual Do Utilizador

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4. Press 
↑ to increase the level of Trigger Delay, which will decrease the 
size of the ring. If you have a 4 kW radar, as the large ring decreases in 
size, the smaller ring in the center of the screen will disappear, leaving 
only one ring.  
 
 
Increase Trigger Delay to diminish the size of the red ring (left). To set 
Trigger Delay correctly, reduce the ring to as small a size as possible, 
while keeping a black circle in the middle (enlarged view, right). 
In either case, continue to increase the Trigger Delay level until the 
ring is as small as possible, while keeping a black circle in the middle. 
Every radar is different, but typically, a setting between 35 and 42 per-
cent will get the job done.  
If you over apply the Trigger Delay, the black circle will disappear. De-
crease the Trigger Delay level and it will reappear. 
3. Press 
EXIT
 to return to the main page display. 
Adjust Heading Line 
The  Heading  Line  command  is  used  to  make  sure  the  green  heading 
line (zero point) on your display is lined up with the bow of your vessel. 
   (Before heading line adjustment)      (After heading line adjustment) 
  
 
The bow of the ship is lined up with the tip of the peninsula (left), but the 
green heading line is not. Adjusting the heading line will allow you to align 
the direction of the heading line with the direction of the bow (right).