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
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
•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.
491 Echo Sounder Operations Manual | Page 3 |
