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Echo Sounder NorthStar 491
Manual
NorthStar Navigation Echo Sounder NorthStar 491 User Manual
Northstar 491 echo sounder, Operations manual
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NorthStar Navigation Echo Sounder NorthStar 491 User Manual | 76 pages
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Table of contents
Document Outline
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
Introducing snapshots
Setting up the video image overlay
6 Reviewing past echoes using SoundTrac
Viewing past echoes using SoundTrac
Marking fish as waypoints
Navigating to a past echo position
7 Setting the Alarms
Understanding the alarms
Setting the fish alarm
Setting the bottom alarm
Setting the temperature alarm
8 Troubleshooting 491 Operations
Troubleshooting the echo sounder
Checking the transducer
A 491 Features and Specifications
Glossary
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