Thank You, Table of Contents | Humminbird 343c specification

531447-1_A_343c_Eng.qxd 11/11/2005 9:18 PM Page 2

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 SeriesTM, DualBeam PLUSTM, Fish ID+TM, Humminbird®, One-Touch® Zoom, QuadraBeamTM, RTS® Window, Structure ID®, Total Screen Update®, TrueArch®, WhiteLine®, WideSide®, and X-PressTMMenu are trademarked by or registered trademarks of Humminbird®.

Table of Contents
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