Humminbird 717, 727 manual How Sonar Works

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531524-1_A - 717 & 727 Man_Eng.qxp 9/30/2006 7:23 PM Page 6

How Sonar Works

Sonar technology is based on sound waves. The 700 Series™ Fishing System uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer.

Your 700 Series™ 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 1/4 of a second. It is unlikely that your boat can "outrun" this sonar signal.

SONAR is an acronym for SOund and NAvigation Ranging. Sonar utilizes precision sound pulses or "pings" which are emitted into the water in a teardrop-shaped beam.

The sound pulses "echo" back from objects in the water such as the bottom, fish and other submerged objects. The returned echoes are displayed on the LCD screen. Each time a new echo is received, the old echoes are moved across the LCD, creating a scrolling effect.

When all the echoes are viewed side by side, an easy to interpret "graph" of the bottom, fish and structure appears.

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Contents Series Operations Manual Thank You Table of Contents Setup Menu Tab Views Menu Tab Accessories Menu Tab Troubleshooting How Sonar Works 531524-1A 717 & 727 ManEng.qxp 9/30/2006 723 PM DualBeam Plus Sonar QuadraBeam Plus Sonar With optional-purchase QuadraBeam Plus TransducerWideSide Sonar With optional-purchase WideSide transducerUniversal Sonar What’s On the Display AboutOrmation Views Sonar View Sonar ViewUnderstanding Sonar History Real Time Sonar RTS Window Freeze Frame and CursorBottom Presentation 531524-1A 717 & 727 ManEng.qxp 9/30/2006 723 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 723 PM Sonar Zoom View Sonar Zoom View200/83 kHz Split Sonar View Big Digits View Big Digits ViewCircular Flasher View Side Beam View, Default Layout Side Beam ViewSide Beam View, Classic Layout Side Beam View, Slanted Layout WideSide View WideSide ViewPOWER/LIGHT Key Key FunctionsView Key Menu Key WAY Cursor Control KeyExit Key Accessory Bus Powering Up the Unit Menu System 531524-1A 717 & 727 ManEng.qxp 9/30/2006 723 PM Start-Up Options Menu Normal OperationSimulator System Status Self TestAccessory Test PC ConnectWith PC Connect Cable only Sonar X-Press Menu Side WideSide transducer WideSide view onlySensitivity Upper Range Lower Range Side Beam Range Chart Speed Bottom ViewQuad Layout Zoom Level Bottom LockSonar Zoom View only Sonar Zoom View only, when Bottom Lock is On Bottom RangeSonar Menu Tab Beam Select Fish ID+ Fish ID Sensitivity Zoom Width KHz SensitivityAdvanced To change the 455 kHz Sensitivity setting Advanced with QuadraBeam Plus transducerWideSide Sensitivity Advanced with WideSide transducerDepth Lines Surface Clutter Noise Filter Max DepthWater Type Transducer Select Alarms Menu Tab Depth Alarm Fish ID AlarmLow Battery Alarm Aux. Temp. AlarmWith optional-purchase temp. probe or Temp/Speed only Temp Alarm Alarm ToneSetup Menu Tab Units Distance Units DepthUnits Temp International onlyUser Mode Units SpeedLanguage Triplog Reset Restore DefaultsSelect Readouts Advanced, Sonar view onlyDefault Sonar View Customized Sonar View Depth Offset Aux. Temp. OffsetTemp Offset Speed CalibrationAdvanced, with Temp/Speed only Digits Format Nmea Output Accessory Test Views Menu TabAccessories Menu Tab Troubleshooting Series Doesn’t Power UpDisplay Problems Problem Possible CauseFinding the Cause of Noise IsolationSeries Fishing System Accessories 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM Specifications Operating Frequency kHz and 83 kHz DualBeam Plus531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM Glossary Sonar Terms531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM Receiver See Transmitter 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM Contact Humminbird