Humminbird 77c manual How Sonar Works, DualBeam Plus Sonar

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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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Contents Matrix 77c Operations Manual Table of Contents Thank YouAlarms Menu Tab Setup Menu TabViews Menu Tab Accessories Menu Tab Troubleshooting Sonar X-Press MenuHow Sonar Works DualBeam Plus SonarTemperature water surface temperature What’s On the DisplayViews Sonar ViewReal 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 ViewBottom Presentation POWER/LIGHT Key Key FunctionsView Key Menu KeyAccessory Bus Powering Up the UnitAdvanced features such as WeatherSense, GPS Exit KeyMenu System Press the Menu key once to displayKeys to reactivate the X-Press Menu Change to the screenExit Normal operation by powering your Fishing System off Start-Up Options MenuNormal Operation SimulatorPC Connect System StatusSonar X-Press Menu To adjust the Sensitivity To adjust the Upper RangeSensitivity Upper RangeLower Range Chart SpeedBottom View To adjust the Zoom Level Zoom LevelSonar Menu Tab Sonar Zoom View OnlyBeam Select Fish ID+To use Beam Select Highlight Beam Select on the Sonar main menuKHz Sensitivity Fish SensitivityDepth Lines Noise Filter Surface ClutterMax Depth Alarms Menu Tab To change the Water Type settingSetting. Fresh, Salt, Default = Fresh Water TypeDepth Alarm Fish ID AlarmLow Battery Alarm Temp AlarmSetup Menu Tab Units DepthUnits Temp Units DistanceUser Mode Triplog ResetRestore Defaults Units SpeedTemperature Select ReadoutsVoltage To Select ReadoutsDepth Offset Temp OffsetSpeed Calibration Nmea OutputViews Menu Tab Accessories Menu TabTo Change the View Status of Any View Troubleshooting Display ProblemsProblem Possible Cause Control head loses power at high speedsFinding the Cause of Noise Matrix Fishing System AccessoriesIsolation Specifications Contact Humminbird