NorthStar Navigation NorthStar 491 manual Setting the bottom alarm, Alarm

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Setting inside or outside ﬁsh markers

Turning the ﬁsh alarm on and off

The alarm

2.Press the CURSOR PAD up or down to set the depth, or use the KEYPAD to manually enter the desired depth.

The depth is displayed in the tab below the SET UPPER MKR key.

To set the depth of the lower marker:

1.At the FISH ALARM window, press SET LOWER MKR.

The lower marker window is highlighted in black.

2.Press the CURSOR PAD up or down to set the depth, or use the KEYPAD to manually enter the desired depth.

The depth is displayed in the tab below the SET LOWER MKR key.

If you designate the markers as inside markers, the fish alarm sounds when fish are detected within these markers. If you set these markers as outside markers, the fish alarm sounds when fish are detected outside of these markers.

To set the markers to inside or outside, at the FISH ALARM window, press INSIDE/OUTSIDE MKRS to toggle between the inside and outside settings. The setting is displayed in the tab below the INSIDE/OUTSIDE MKRS key.

To turn the alarm on, at the FISH ALARM window, press TURN ALARM ON. Generally, you’ll want to turn the alarm on after making all the other settings.

To turn the alarm off, press TURN ALARM OFF.

When fish are detected, the alert tone sounds and the message “FISH!” is displayed. This message clears automatically after 20 seconds and the alarm is rearmed.

Setting the bottom alarm

When the bottom alarm is set, an alarm sounds if the echo sounder detects that the bottom is shallower than the limit you’ve set.

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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 Organization Using this manualWelcome to the Northstar Conventions Hearing from you Service and repairTechnical support How echo sounding works 961/962 echo sounder system components Using 491 with the 961/962 Powering the 491 on and offSetting up 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 Chart Overlay screen Using demo modeAt the Chart Overlay Selection window, press Echo sounding Depth and temperatureIntroducing the displayed information Navigation Status tabsUsing automatic mode Cruising or ﬁshing50 kHz 200 kHz Manually overriding automatic modeChanging the frequency of echoes Echo screen with both frequencies displayed Choosing the zoom scale Choosing a zoom modeZooming in and out 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 Viewing the depth marker Changing the depth settingsViewing the seabed depth 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 screenScope on dual-frequency echo screen Setting the Echo screen dataUsing the A-scope with dual frequencies 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 windowTemperature alarm window Setting the temperature alarmTurning the bottom alarm on and off 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