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NorthStar 491 manual Echo Sounder Operations Manual
Models:
NorthStar 491
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Troubleshooting
Performance characteristics
Chart Overlay screen
Setting up
7Setting the Alarms
Setting the white level
Depth and temperature
Service and repair
Using this manual
Choosing a zoom mode
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491 Echo Sounder Operations Manual
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Contents
Northstar Echo Sounder
Contents
Reviewing past echoes using SoundTrac
Troubleshooting 491 Operations
Page
1Welcome
Using this manual
Welcome to the Northstar
Organization
Conventions
Service and repair
Technical support
Hearing from you
How echo sounding works
961/962 echo sounder system components
Powering the 491 on and off
Setting up
Using 491 with the 961/962
Using the 491 with the 957/958
Press the Port Setup Options key
961/962 echo sounder menu structure
957/958 echo sounder menu structure
2Quick Start Using the Echo Sounder
Displaying the echo sounder’s picture
Illustrated Echo screen
Illustrated Soundtrac screen
Using demo mode
At the Chart Overlay Selection window, press
Chart Overlay screen
Echo sounding
Depth and temperature
Introducing the displayed information
Navigation Status tabs
Using automatic mode
Cruising or fishing
Manually overriding automatic mode
Changing the frequency of echoes
50 kHz 200 kHz
Echo screen with both frequencies displayed
Choosing a zoom mode
Zooming in and out
Choosing the zoom scale
Using bottom zoom
Using bottom lock zoom
Using bottom lock/ center zoom
Setup functions
Accessing the setup screen
Entering numerical values
Changing the depth units
Changing the temperature graph’s units and scale
Transducer depth
Number of special waypoints
Speed and temperature sensor setup
961/962 sensor setup screen
957958/ sensor setup screen
3Adjusting the Echo Sounder Picture
Adjusting the gain strong echoes
Picture menu
Adjusting the clutter weak echoes
Gain window
Adjusting the signal level weak echoes
Clutter window
Suppressing interference the noise limiter
Selecting the color bar hue and white level
Understanding the color bar
Setting the white level
Hue and white level window
Echo Sounder Operations Manual
4Understanding Depth Settings
Changing the depth settings
Viewing the seabed depth
Viewing the depth marker
Setting the picture’s shift starting depth
Shift window
Setting the picture’s range
Range window
Echo Sounder Operations Manual
5Other Functions Using the More key
Using the More key
Changing the advance speed
Displaying the A-scope
Scope on single-frequency echo screen
Setting the Echo screen data
Using the A-scope with dual frequencies
Scope on dual-frequency echo screen
Bottom depth box Temperature box
Echo screen data selections
Speed through the water
Temperature graph
Introducing snapshots
Taking and storing a snapshot
Archiving and restoring a snapshot with a floppy disk
Snapshot screen 961/962 only
Archiving and restoring snapshots with a Zip disk
Archiving snapshots screen 961/962 only
Setting up the video image overlay
Echo Sounder Operations Manual
6Reviewing past echoes using SoundTrac
Viewing past echoes using SoundTrac
SoundTrac screen
Marking fish as waypoints
Navigating to a past echo position
Going directly to a past echo position
Selected Cursor Position window appears
7Setting the Alarms
Understanding the alarms
Setting the fish alarm
Setting the upper and lower marker depths
Fish alarm window
Alarm
Setting the bottom alarm
Setting inside or outside fish markers
Turning the fish alarm on and off
Setting the bottom level
Bottom alarm window
Setting the temperature alarm
Turning the bottom alarm on and off
Temperature alarm window
Turning the temperature alarm on and off
Upper limit window is highlighted in black
When the temperature alarm sounds, an alert message is
8Troubleshooting 491 Operations
Troubleshooting the echo sounder Checking the transducer
Troubleshooting the echo sounder
No echoes displayed when Star key is pressed
Checking the transducer
OFF
Manufacturer Model Power Northstar P/N
Maintaining a transducer
A491 Features and Specifications
Performance characteristics
Screen notations
Physical characteristics
Environmental characteristics
Interfacing
Manual controls
ON/OFF
Echo Sounder Operations Manual
Glossary
Echo Sounder Operations Manual