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 is usually adequate for most conditions. Experiment with your unit to find the Grayline setting that's best for you.
To change the Grayline level, repeatedly press MENU until the GRAYLINE scroll bar appears.
Press ↑ to increase Grayline, ↓ to decrease it. Echoes scrolling on the screen will show the effects of the Grayline adjustment.
If you reach the maximum or minimum level, a tone sounds alerting you to the limits. Press PWR to clear the menu.
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