NorthStar Navigation NorthStar 491 manual Setting the picture’s range

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In the large rectangle on the right, the blue area at the top (with waves) represents the surface of the water, and the brown area below represents the seabed.

The number at the bottom is the depth of the picture, and the seabed depth is also labelled.

The smaller rectangle inside the larger one represents the echo sounder’s picture. As you move the shift (and range) settings, this rectangle adjusts to show what you will see on the echo screen.

A horizontal black arrow points to the value that this win- dow adjusts: the depth at which the echo sounder picture starts, relative to the surface of the water.

3.Press the CURSOR PAD up or down to shift the picture, or use the KEYPAD to enter the digits of the desired depth. If you type the number on the keypad, wait a moment for the system to enter the number.

4.Press RETURN to go back to the ECHO screen.

Adjusting shift changes the AUTO and DEPTH key tabs from green to yellow, since the echo sounder is no longer in automatic mode.

Setting the picture’s range

The range setting adjusts the overall depth covered by the echo sounder picture, from the top of its display to the bottom. The range can be set automatically (by pressing AUTO), or manually on the SET RANGE window.

To set the range:

1.At the ECHO screen, press DEPTH.

2.Press RANGE.

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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 OperationsPage 1Welcome Using this manual Welcome to the NorthstarOrganization Conventions Service and repair Technical supportHearing from you How echo sounding works 961/962 echo sounder system components Powering the 491 on and off Setting upUsing 491 with the 961/962 Using the 491 with the 957/958 Press the Port Setup Options key961/962 echo sounder menu structure 957/958 echo sounder menu structure 2Quick Start Using the Echo Sounder Displaying the echo sounder’s picture Illustrated Echo screenIllustrated Soundtrac screen Using demo mode At the Chart Overlay Selection window, pressChart Overlay screen Echo sounding Depth and temperatureIntroducing the displayed information Navigation Status tabsUsing automatic mode Cruising or fishingManually overriding automatic mode Changing the frequency of echoes50 kHz 200 kHz Echo screen with both frequencies displayed Choosing a zoom mode Zooming in and outChoosing the zoom scale Using bottom zoom Using bottom lock zoomUsing bottom lock/ center zoom Setup functions Accessing the setup screenEntering numerical values Changing the depth units Changing the temperature graph’s units and scaleTransducer depth Number of special waypointsSpeed and temperature sensor setup 961/962 sensor setup screen957958/ sensor setup screen 3Adjusting the Echo Sounder Picture Adjusting the gain strong echoes Picture menuAdjusting the clutter weak echoes Gain windowAdjusting the signal level weak echoes Clutter windowSuppressing interference the noise limiter Selecting the color bar hue and white level Understanding the color barSetting the white level Hue and white level windowEcho Sounder Operations Manual 4Understanding Depth Settings Changing the depth settings Viewing the seabed depthViewing the depth marker Setting the picture’s shift starting depth Shift windowSetting the picture’s range Range window Echo Sounder Operations Manual 5Other Functions Using the More key Using the More key Changing the advance speedDisplaying the A-scope Scope on single-frequency echo screenSetting the Echo screen data Using the A-scope with dual frequenciesScope on dual-frequency echo screen Bottom depth box Temperature box Echo screen data selectionsSpeed through the water Temperature graphIntroducing snapshots Taking and storing a snapshotArchiving and restoring a snapshot with a floppy disk Snapshot screen 961/962 onlyArchiving and restoring snapshots with a Zip disk Archiving snapshots screen 961/962 onlySetting up the video image overlay Echo Sounder Operations Manual 6Reviewing past echoes using SoundTrac Viewing past echoes using SoundTrac SoundTrac screenMarking fish as waypoints Navigating to a past echo positionGoing directly to a past echo position Selected Cursor Position window appears7Setting the Alarms Understanding the alarms Setting the fish alarmSetting the upper and lower marker depths Fish alarm windowAlarm Setting the bottom alarmSetting inside or outside fish markers Turning the fish alarm on and offSetting the bottom level Bottom alarm windowSetting the temperature alarm Turning the bottom alarm on and offTemperature alarm window Turning the temperature alarm on and off Upper limit window is highlighted in blackWhen the temperature alarm sounds, an alert message is 8Troubleshooting 491 Operations Troubleshooting the echo sounder Checking the transducerTroubleshooting the echo sounder No echoes displayed when Star key is pressedChecking the transducer OFFManufacturer Model Power Northstar P/N Maintaining a transducerA491 Features and Specifications Performance characteristicsScreen notations Physical characteristicsEnvironmental characteristics InterfacingManual controls ON/OFFEcho Sounder Operations Manual Glossary Echo Sounder Operations Manual
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