Table Of Contents - NorthStar Echo Sounder 491 Operation Manual

Contents
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1 Welcome
Welcome to the Northstar 491
Using this manual
Technical support
How echo sounding works
Powering the 491 on and off
Setting up the 491
2 Quick Start: Using the Echo Sounder
Displaying the echo sounder's picture
Using demo mode
Introducing the displayed information
Using automatic mode
Changing the frequency of echoes
Zooming in and out
Setup functions
3 Adjusting the Echo Sounder Picture
The picture menu
Adjusting the gain (strong echoes)
Adjusting the clutter (weak echoes)
Adjusting the signal level (weak echoes)
Suppressing interference (the noise limiter)
Selecting the color bar (hue) and white level
4 Understanding Depth Settings
Viewing the seabed depth
Viewing the depth marker
Changing the depth settings
Setting the picture's shift (starting depth)
Setting the picture's range
5 Other Functions: Using the MORE key
Using the MORE key
Changing the advance speed
Displaying the A-scope
Setting the ECHO screen data
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