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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.