Humminbird 343c manual Specifications, Glossary, Sonar Terms

531447-1_A_343c_Eng.qxd 11/11/2005 9:18 PM Page 60

Specifications

Depth Capability	1000 ft (330 m)
Power Output	300 Watts (RMS), 2400 Watts (Peak to Peak)
Operating Frequency	200 kHz and 83 kHz DualBeam PLUS™
Area of Coverage	60° @ -10 dB in 83 kHz
	20° @ -10 dB in 200 kHz
Target Separation	2 1/2 Inches (63.5 mm)
Power Requirement	10-20 VDC
LCD Matrix	320 V x 240 H
Transducer	XHS-9-20-T
Transducer Cable Length	20 ft (6 m)
Current Draw	0.383 Amps

NOTE: Humminbird® verifies maximum stated depth in saltwater conditions, but actual depth performance may vary due to transducer installation, water type, thermal layers, bottom composition and slope.

NOTE: Product specifications and features are subject to change without notice.

Glossary

Sonar Terms:

Alarm, Depth: Depth Alarm is a user-controllable, audible alert that sounds when depth is less than or equal to the setting.

Alarm, Temperature: Temperature Alarm is a user-controllable, audible alert that sounds when the water surface temperature equals the setting.

Backlight: Backlight is a user-controllable illumination for the LCD for night and low light use.

Beam (Sonar Beam): A sonar beam is the cone-shaped projection of sound waves formed as sound travels underwater. See Cone Angle.

Big Digits View: Big Digits View is a Humminbird® feature that displays the sonar graph and enlarged digital readouts for easy reading from a distance. This is a great tool when monitoring the digital depth is important - such as with higher boat speeds, or when viewing the unit from a distance. When speed input is available, the Big Digits View also shows the TripLog. See TripLog.

Bottom Black: Bottom Black is a Humminbird® feature that "fills in" the area of the display below the bottom contour. Bottom Black is preferred by some anglers because of its high contrast and easy readability, even though it can obscure bottom hardness information.

Bottom Contour: Bottom Contour is the profile of the bottom graphed to the display as the depth changes.

Bottom Hardness: Bottom Hardness is the density (or composition) of the bottom, which can often be determined by interpreting the main sonar return. Varying levels of hardness can be determined by interpreting the "thickness" of the sonar return. Hard returns appear thin and black, softer returns appear thicker and less black. It is important to note that a sonar return from a sloping bottom can have the appearance of a softer bottom.

Cavitation: Cavitation is the effect of air bubbles created as the propeller rotates and the boat moves through the water.

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