Lowrance electronic PRO X51 Benutzerhandbuch

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To adjust Sensitivity, press 
MENU
 until the 
S
ENSITIVITY 
A
DJUSTMENT
 
menu appears. Press 
UP ARROW
 to increase the sensitivity, 
DOWN ARROW
 to decrease it. When it's set at the desired level, 
press 
PWR
 to clear the menu. 
 
NOTE: 
If you want to change the sensitivity in Manual 
Mode, first turn off Auto Sensitivity: press 
MENU
 
until the 
S
ENSITIVITY 
A
UTOMATIC
/M
ANUAL
 menu appears. 
Press 
DOWN ARROW
 to select 
M
ANUAL
, then press 
PWR
 to 
clear the menu. To adjust the sensitivity, follow the same 
steps used for adjusting sensitivity in auto mode above. 
Grayline
®
 
Grayline
®
 lets you distinguish between strong and weak 
echoes. It "paints" gray on targets that are stronger than a 
preset value. This allows you to tell the difference between a 
hard and soft bottom. For example, a soft, muddy or weedy 
bottom returns a weaker signal which is shown with a 
narrow or no gray line. A hard bottom returns a strong 
signal which causes a wide gray line. 
To change the Grayline level, press 
MENU
 until the 
G
RAYLINE
 menu appears. 
        
 
At left, little Grayline indicates a soft bottom, probably sand or mud. 
At right, the wider Grayline indicates a harder, rocky bottom. 
Press 
UP ARROW
 to increase the level or press 
DOWN ARROW
 to 
decrease it. The percentage of Grayline in use shows in this menu. 
Echoes scrolling onto the screen will also show the effects of the 
Grayline change. If you reach the maximum or minimum level, a tone 
sounds alerting you to the limits. Press 
PWR
 to clear the menu. 
Wider 
Grayline
®
Thin or no Grayline
®