Humminbird 343c - Manual (Page 2)

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Thank You!
Thank you for choosing Humminbird®, America's #1 name in fishfinders. Humminbird®
has built its reputation by designing and manufacturing top-quality, thoroughly reliable
marine equipment. Your Humminbird® is designed for trouble-free use in even the
harshest marine environment. In the unlikely event that your Humminbird® does
require repairs, we offer an exclusive Service Policy - free of charge during the first year
after purchase, and available at a reasonable rate after the one-year period. For complete
details, see the separate warranty card included with your unit. We encourage you to
read this operations manual carefully in order to get full benefit from all the features
and applications of your Humminbird® product.
Contact our Customer Resource Center at either 1-800-633-1468 or visit our website
at www.humminbird.com.
WARNING! This device should not be used as a navigational aid to prevent collision,
grounding, boat damage, or personal injury. When the boat is moving, water depth may
change too quickly to allow time for you to react. Always operate the boat at very slow
speeds if you suspect shallow water or submerged objects.
WARNING! Disassembly and repair of this electronic unit should only be performed by
authorized service personnel. Any modification of the serial number or attempt to repair
the original equipment or accessories by unauthorized individuals will void the warranty.
Handling and/or opening this unit may result in exposure to lead, in the form of solder.
WARNING! This product contains lead, a chemical known to the state of California to
cause cancer, birth defects and other reproductive harm.
300 Series TM , DualBeam PLUS TM , Fish ID+ TM , Humminbird®, One-Touch® Zoom, QuadraBeam TM , RTS®
Window, Structure ID®, Total Screen Update®, TrueArch®, WhiteLine®, WideSide®, and X-Press TM Menu are
trademarked by or registered trademarks of Humminbird®.
© 2005 Humminbird®, Eufaula AL, USA. All rights reserved.
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How Sonar Works 1
DualBeam PLUS™ Sonar ........................................................................................................................ 4
What’s On the Display 5
Views 7
Sonar View ................................................................................................................................................ 8
Understanding Sonar History .............................................................................................................. 9
Real Time Sonar (RTS®) Window........................................................................................................ 10
Freeze Frame .......................................................................................................................................... 10
Bottom Presentation .............................................................................................................................. 11
Sonar Zoom View .................................................................................................................................. 13
200/83 kHz Split Sonar View.............................................................................................................. 14
Big Digits View ........................................................................................................................................ 15
Circular Flasher View ............................................................................................................................ 15
Key Functions 16
POWER/LIGHT Key ................................................................................................................................ 16
VIEW Key ................................................................................................................................................ 16
MENU Key ................................................................................................................................................ 17
4-WAY Cursor Control Key .................................................................................................................... 17
EXIT Key .................................................................................................................................................... 18
Powering Up the Unit 19
The Menu System 20
Start-Up Options Menu 22
Normal Operation.................................................................................................................................. 22
Simulator ................................................................................................................................................ 23
System Status ........................................................................................................................................ 24
Sonar X-Press™ Menu 25
Sensitivity ................................................................................................................................................ 26
Upper Range (Advanced: Sonar, Split Sonar, Big Digits and Circular Flasher Views only) ............ 27
Lower Range............................................................................................................................................ 28
Chart Speed ............................................................................................................................................ 29
Zoom Level (Sonar Zoom view only).................................................................................................... 29
Bottom Lock ............................................................................................................................................ 30
Bottom Range (Sonar Zoom View only, when Bottom Lock is On).................................................. 30
Table of Contents
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