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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 and fish from structure.
A small amount of Grayline indicates a soft bottom (left), probably
sand or mud. More Grayline indicates a harder, rocky bottom (right).
Grayline is adjustable. Since Grayline shows the difference between
strong and weak signals, adjusting the sensitivity may also require a
different Grayline level.
Wider
Gra
y
line
Thin or no Grayline