Furuno CSH-5L/CSH-8L manual Interpreting The Display, Bottom Echo, Bottom echoes

6.INTERPRETING THE DISPLAY

6.1Bottom Echo

When the tilt angle is changed, the bottom echo will appear on the screen. When the tilt angle is decreased, the bottom trace becomes wider and weaker. By observing the bottom condition on the screen, the skipper can prevent the net from being damaged by a reef or a shipwreck.

(A) Flat bottom

Tilt angle: 10˚ to 15˚

(B) Flat bottom

Tilt angle: 20˚ or more

(C) Sloping bottom

Tilt angle: 20˚ or more

Decreased tilt angle Only half of vertical beam width captures the bottom.

Bottom is displayed narrower and in stronger colors when compared to (A).

Shallow bottom is displayed in a strong color and with a short tail.

Bottom

The deeper, sloping bottom echo is displayed in a weak color and with a long tail.

Bottom echoes

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