NorthStar Navigation NorthStar 491 Benutzerhandbuch

Contents

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Welcome to the Northstar 491

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Using this manual

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Technical support

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How echo sounding works

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Powering the 491 on and off

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Setting up the 491

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2 Quick Start: Using the Echo Sounder

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Displaying the echo sounder’s picture

Using demo mode

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Introducing the displayed information

Using automatic mode

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Changing the frequency of echoes

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Zooming in and out

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Setup functions

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3 Adjusting the Echo Sounder Picture

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The picture menu

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Adjusting the gain (strong echoes)

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Adjusting the clutter (weak echoes)

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Adjusting the signal level (weak echoes)

Suppressing interference (the noise limiter)

Selecting the color bar (hue) and white level

4 Understanding Depth Settings

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Viewing the seabed depth

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Viewing the depth marker

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Changing the depth settings

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Setting the picture’s shift (starting depth)

Setting the picture’s range

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5 Other Functions: Using the MORE key

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Using the MORE key

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Changing the advance speed

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Displaying the A-scope

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Setting the ECHO screen data

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