NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 5)

491 Echo Sounder Operations Manual Page 1
1
Welcome
Welcome to the Northstar 491 . . . . . . . . . . . . . 1-2
Using this manual . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Technical support . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
How echo sounding works . . . . . . . . . . . . . . . . . 1-5
Powering the 491 on and off . . . . . . . . . . . . . . 1-7
Setting up the 491 . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
T
his chapter introduces the Northstar 491 Operations
Manual , explains how to contact Northstar for technical
support and service, and describes the 491’s basic set-up and
power on/off procedures.