30
These figures show results of different sensitivity levels on the same
location. Fig. 1: Sensitivity at 98 percent, determined by Auto Sensitiv-
ity. Typical of full auto mode. Fig. 2: Sensitivity set at 71 percent. Fig.
3: Sensitivity set at 47 percent. Fig. 4: Sensitivity set at 100 percent.
Grayline
®
Grayline
®
lets you distinguish between strong and weak echoes. It al-
lows you to tell the difference between a hard and soft bottom. For ex-
ample, a soft, muddy or weedy bottom returns a weaker signal which is
shown with a narrow line or no gray line at all. A hard bottom returns
a strong signal, which will be displayed as a wide gray line.
Grayline scroll bar.
If you have two signals of equal size, one with gray and the other with-
out, then the target with gray is the stronger signal. This helps distin-
guish weeds from trees on the bottom or fish from structure.
Grayline is adjustable. Since Grayline shows the difference between
strong and weak signals, adjusting the sensitivity may also require a
different Grayline level. The level chosen by the sonar unit at power on
Fish
arches
