User ManualTable of ContentsSECTION ONE - Introduction5Welcome to the Northstar 4915Who should read this manual5Scope of this manual5Installation considerations6SECTION TWO - Installing the transducer7Safety considerations7Selecting a transducer8Installation considerations9Choosing a mounting location9Installing the transducer11Maintaining the transducer12Using anti-fouling paint12Cleaning a transducer13SECTION THREE - Installing the 49115Safety considerations15System components17Choosing a mounting location18Mounting the 49118Wiring the 49119Electrical power requirements19Connecting the 491 to ship’s power19Connecting the 491 to the 961/96219Connecting the 491 to the 957/958/ 6000i21Connecting the 491 to a transducer22Initial checkout23Turning the 491 on23For the 961/96223For the 957/958/6000i24Setting up the echo sounder24Turning the 491 off24Installation test checklist24SECTION FOUR - Troubleshooting and servicing the 49125Common 491 installation problems25The status LED25Getting technical support28Hearing from you29Ordering replacement parts29Servicing the 49129Returning a 491 for service30APPENDIX A - Technical specifications31Glossary33cavitation33deadrise33echo sounder33fairing block33transducer33water column33Index35Size: 948 KBPages: 38Language: EnglishOpen manual
User ManualTable of Contents1 Welcome5Welcome to the Northstar 4916Using this manual6Technical support8How echo sounding works9Powering the 491 on and off11Setting up the 491112 Quick Start: Using the Echo Sounder15Displaying the echo sounder’s picture16Using demo mode18Introducing the displayed information19Using automatic mode20Changing the frequency of echoes21Zooming in and out23Setup functions263 Adjusting the Echo Sounder Picture31The picture menu32Adjusting the gain (strong echoes)32Adjusting the clutter (weak echoes)33Adjusting the signal level (weak echoes)34Suppressing interference (the noise limiter)35Selecting the color bar (hue) and white level364 Understanding Depth Settings39Viewing the seabed depth40Viewing the depth marker40Changing the depth settings40Setting the picture’s shift (starting depth)41Setting the picture’s range425 Other Functions: Using the MORE key45Using the MORE key46Changing the advance speed46Displaying the A-scope47Setting the ECHO screen data48Introducing snapshots50Setting up the video image overlay536 Reviewing past echoes using SoundTrac55Viewing past echoes using SoundTrac56Marking fish as waypoints57Navigating to a past echo position577 Setting the Alarms59Understanding the alarms60Setting the fish alarm60Setting the bottom alarm62Setting the temperature alarm648 Troubleshooting 491 Operations67Troubleshooting the echo sounder68Checking the transducer69A 491 Features and Specifications71Glossary75Size: 2.78 MBPages: 76Language: EnglishOpen manual
