How Sonar Works, DualBeam Plus Sonar | Humminbird 77c guide

M77_Man_Eng_531350-1_B.qxd 1/3/2005 4:29 PM Page 6

How Sonar Works

Sonar technology is based on sound waves. The Matrix™ Fishing System uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer.

Your Matrix™ Fishing System sends a sound wave signal and determines distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off of an object; it then uses the reflected signal to interpret location, size, and composition of an object.

Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back again in less than ¼ of a second. It is unlikely that your boat can "outrun" this sonar signal.

DualBeam PLUS™ Sonar

Your Matrix™ 77c uses a 200/83 kHz DualBeam PLUS™ sonar system with a wide (60°) area of coverage. DualBeam PLUS™ sonar returns can be blended together, viewed separately or compared side-by-side. DualBeam PLUS™ is ideal for a wide range of conditions - from shallow to very deep water in both fresh and salt water. Depth capability is affected by such factors as boat speed, wave action, bottom hardness, water conditions and transducer installation.

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Humminbird 77c manual How Sonar Works, DualBeam Plus Sonar

Contents

Matrix 77c Operations Manual Table of Contents Thank You Alarms Menu Tab Setup Menu TabViews Menu Tab Accessories Menu Tab Troubleshooting Sonar X-Press Menu How Sonar Works DualBeam Plus Sonar Temperature water surface temperature What’s On the Display Views Sonar View Real Time Sonar RTS Window Understanding Sonar HistorySonar Zoom View 200/83 kHz Split Sonar View Big Digits View200/83 kHz Split Sonar View Big Digits View Bottom Presentation POWER/LIGHT Key Key FunctionsView Key Menu Key Accessory Bus Powering Up the UnitAdvanced features such as WeatherSense, GPS Exit Key Menu System Press the Menu key once to displayKeys to reactivate the X-Press Menu Change to the screen Exit Normal operation by powering your Fishing System off Start-Up Options MenuNormal Operation Simulator PC Connect System StatusSonar X-Press Menu To adjust the Sensitivity To adjust the Upper RangeSensitivity Upper Range Lower Range Chart SpeedBottom View To adjust the Zoom Level Zoom LevelSonar Menu Tab Sonar Zoom View Only Beam Select Fish ID+To use Beam Select Highlight Beam Select on the Sonar main menu KHz Sensitivity Fish SensitivityDepth Lines Noise Filter Surface ClutterMax Depth Alarms Menu Tab To change the Water Type settingSetting. Fresh, Salt, Default = Fresh Water Type Depth Alarm Fish ID AlarmLow Battery Alarm Temp Alarm Setup Menu Tab Units DepthUnits Temp Units Distance User Mode Triplog ResetRestore Defaults Units Speed Temperature Select ReadoutsVoltage To Select Readouts Depth Offset Temp OffsetSpeed Calibration Nmea Output Views Menu Tab Accessories Menu TabTo Change the View Status of Any View Troubleshooting Display ProblemsProblem Possible Cause Control head loses power at high speeds Finding the Cause of Noise Matrix Fishing System AccessoriesIsolation Specifications Contact Humminbird