Eagle Electronics FISHEASY 245DS - Manual (Page 49)

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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.
Wider
Grayline
® Thin or no Grayline
®