Eagle Electronics FISHEASY 240 - Manual (Page 57)

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Sensitivity
Sensitivity controls the unit's ability to pick up echoes. If you want to
see more detail, try increasing the sensitivity, a little at a time. There
are situations when too much clutter appears on the screen. Decreasing
the sensitivity can reduce the clutter and show the strongest fish ech-
oes, if fish are present. As you change the sensitivity setting, you can
see the difference on the chart as it scrolls.