Thin or no Grayline→
Wider Grayline→
A small amount of Grayline indicates a soft bottom (left), probably sand or mud. More Grayline indicates a harder, rocky bottom (right).
Chart Speed
The speed at which echoes scroll across the screen is called the chart speed. The default for this unit is "max" (100 percent). We recommend you leave the scroll speed setting there for most all fishing conditions.
Chart Speed scroll bar.
You, however, might consider experimenting with chart speed when you are stationary or drifting very slowly.
45