NorthStar Echo Sounder 491 Operation Manual page 3

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
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