NorthStar Navigation - NorthStar 491
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Northstar 491 Echo Sounder Operations Manual This manual is for using the 491 sounder with the Northstar 957 958 961 and 962 navigators For the Northstar 6000i information in Section 6 of its manual can be used instead Revision A Part Number GM494 Northstar a unit of Brunswick New Technologies Marine Electronics 30 Sudbury Road Acton Massachusetts 01720 www NorthstarNav com Service 978 897 6600 Sales 800 628 4487 Contents 1 Welcome 1 Welcome to the Northstar 491 2 Using this manual 2 Technical support 4 How echo sounding works 5 Powering the 491 on and off 7 Setting up the 491 7 2 Quick Start Using the Echo Sounder 11 Displaying the echo sounder s picture 12 Using demo mode 14 Introducing the displayed information ...