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491 Echo Sounder Operations Manual Page 3
Chapter 4 describes how to adjust the depth settings to choose
what portion of the water under the vessel you’ll display.
Chapter 5 explains other functions—the A-Scope, etc.
Chapter 6 describes Northstar’s exclusive SoundTrac™ feature,
for accessing past echoes and navigating back to their
locations.
Chapter 7 tells how to use the echo sounder’s alarms: the fish
alarm, bottom alarm, and temperature alarm.
At the back of the manual are a glossary and an appendix
outlining the 491’s specifications.
Conventions
Specific conventions are used to provide a consistent way to
recognize certain information, as follows:
• is the universal symbol used for caution and warning
information that pertains to your personal safety or pre-
vents damage to the 491. The
CAUTION
and
WARNING
boxes contain critical information—please read them!
•
NOTE
is the type style used for titles of reader notes. These
notes contain valuable information purposely highlighted
so that you don’t miss it while reading the main text.
•
KEY
is the type style used to refer to the menu keys on
the display screen.
•
DISPLAY TEXT
is the type style representing text on the
display screens.
• A bulleted list contains a series of related items or topics.
• A numbered list contains a series of steps in a procedure.