NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 3)

Introducing snapshots . . . . . . . . . . . . . . . . . 46
Setting up the video image overlay . . . . . . . 49
6 Reviewing past echoes using SoundTrac . . . . . 51
Viewing past echoes using SoundTrac . . . . . 52
Marking fish as waypoints . . . . . . . . . . . . . . 53
Navigating to a past echo position . . . . . . . . 53
7 Setting the Alarms . . . . . . . . . . . . . . . . . . . . . . . . . 55
Understanding the alarms . . . . . . . . . . . . . . 56
Setting the fish alarm . . . . . . . . . . . . . . . . . . 56
Setting the bottom alarm . . . . . . . . . . . . . . . 58
Setting the temperature alarm . . . . . . . . . . . 60
8 Troubleshooting 491 Operations . . . . . . . . . . . . 63
Troubleshooting the echo sounder . . . . . . . 64
Checking the transducer . . . . . . . . . . . . . . . 65