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491 Echo Sounder Operations Manual
Welcome to the Northstar 491
Congratulations on your purchase of the Northstar 491 Echo
Sounder. The 491 connects with a Northstar navigator and a
third-party transducer to add echo sounding capability to the
Northstar 957, 958, 961, and 962 navigators. See the
Northstar
491 Installation Manual
(part number GM495) for
recommended transducers.
You may be adding the 491 to your existing Northstar
navigator for echo sounding, or you may have purchased your
navigator complete with echo sounding. In either case, the 491
should be installed and configured by a qualified marine
technician.
To get started right away, Section 2, ”Quick Start: Using the
Echo Sounder,” starting on page 2-11.
Using this manual
Organization
Chapter 1 introduces you to the 491 echo sounder and to this
operations manual.
Chapter 2 gives you a quick-start introduction to get you
started with echo sounding as soon as the 491 has been
installed and configured.
Chapter 3 tells how to adjust the echo sounder’s display—the
gain, clutter, colors, etc.
CAUTION!
Proper installation and configuration of your Northstar
491 is of utmost importance for accurate and effective
performance under a variety of conditions. To get the
best performance from your 491, Northstar strongly rec-
ommends installation and set-up by a qualified marine
technician. For installation procedures, see the Northstar
491 Echo Sounder Installation Manual (Part Number
GM495).