Changing The Vertical Angle Of The Sonar Beams - Kongsberg Simrad ST90 Reference Manual

Fish-finding sonar

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Simrad ST90 Reference Manual

Place the cursor on the button. Press and hold the left mouse button. Move the

cursor horizontally over the button. Release the mouse button when requested

value is shown.

Select the middle of the button to open it. If you have a keyboard connected to the

ST90 system, type the requested value.

Open the button and select

views in the current presentation mode.

Changing the vertical angle of the sonar beams

In order to detect fish or schools in the water column you may need to change the angle of

the sonar beams. The transmitted sonar beams can be tilted electronically.

The current tilt is shown with a solid line in the Vertical view. In the Horizontal view, the

current settings for range, gain and tilt are shown in the top left corner of the view.

With 0° tilt the sonar beam is transmitted in parallel with the sea surface. With +60 degrees

tilt the beam is directed towards the bottom.

The challenge is to find a tilt that prevents the fish echoes to be "buried" in reverberation

and bottom echoes.

• If you use a high tilt value (A) the fish are easily disguised by bottom echoes. A strong

RCG (Reverberation Controlled Gain) setting will remove the bottom echoes. As the

distance from the bottom to the fish increases, the fish echoes become clearer. However,

this assumes that the fish echoes are considerably stronger than the bottom echoes.

if you wish to use the chosen setting in all the

Apply to all