Humminbird manual 531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM

Page 93

531524-1_A - 717 & 727 Man_Eng.qxp 9/30/2006 7:24 PM Page 93

Structure: Structure is a general term for objects on the bottom that present a discontinuity and are a likely attractor for fish. This includes bottom contour features (drop-offs, humps, and holes), standing structure (stumps, timbers, brush piles) and a wide range of other potential objects (sunken boats, reefs). Humminbird® units excel at showing structure with great detail over a wider area due to unique sonar configurations developed for the angler.

Structure ID®: Structure ID® is a Humminbird® feature that describes the traditional grayscale method of presenting sonar information. See Grayscale.

Surface Clutter: Surface Clutter is a phenomenon where sonar returns are reflected off of tiny objects near the surface of the water, including algae and even air bubbles. Typically, saltwater environments have significantly greater surface clutter than freshwater due to continuous wind and wave action that causes aeration at the surface. The Surface Clutter menu provides manual control to bias the default settings under extreme conditions.

Target Separation: Target Separation is the measurement of minimum distance that a fishfinder needs to be able to recognize two very close objects as two distinct targets (i.e. two fish hanging very close, or a fish hanging very close to structure). Humminbird® fishfinders provide a very good 2 1/2 inches of target separation in shallower than 100 feet of depth. Target separation decreases as depth increases due to the need for longer Pulse Width to achieve greater depth. See Pulse Width.

Thermoclines: Thermoclines are water layer(s) of distinctly different temperatures that create a sonar reflection due to the density of the differing water temperatures. Typically a thermocline will appear as a continuous band across the display at some distance above the bottom contour. Thermoclines are of interest to anglers because fish will suspend above or below the thermocline as they seek the optimum temperature and oxygen levels.

Time Variable Gain: Time Variable Gain is a processing step applied to the sonar return to "normalize" the data so that objects of equal size (i.e. fish) appear to be the same size, even if they are separated by a good distance. Time Variable Gain is a fundamental attribute of good sonar, but is often promoted as a feature.

Total Screen Update®: A Humminbird® feature that refreshes and updates all the sonar information on the display when a range change occurs. Without Total Screen Update®, only the most recent sonar information would be drawn to the

88

Page 92 Page 94
Image 93
Page 92 Page 94
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 With optional-purchase QuadraBeam Plus Transducer QuadraBeam Plus SonarWith optional-purchase WideSide transducer WideSide SonarUniversal Sonar About What’s On the DisplayOrmation Views Sonar View Sonar ViewUnderstanding Sonar History Freeze Frame and Cursor Real Time Sonar RTS WindowBottom 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 Side Beam View, Default LayoutSide Beam View, Classic Layout Side Beam View, Slanted Layout WideSide View WideSide ViewPOWER/LIGHT Key Key FunctionsView Key WAY Cursor Control Key Menu KeyExit Key Accessory Bus Powering Up the Unit Menu System 531524-1A 717 & 727 ManEng.qxp 9/30/2006 723 PM Normal Operation Start-Up Options MenuSimulator Self Test System StatusAccessory Test PC ConnectWith PC Connect Cable only Sonar X-Press Menu WideSide transducer WideSide view only SideSensitivity Upper Range Lower Range Side Beam Range Bottom View Chart SpeedQuad Layout Zoom Level Bottom LockSonar Zoom View only Bottom Range Sonar Zoom View only, when Bottom Lock is OnSonar Menu Tab Beam Select Fish ID+ Fish ID Sensitivity Zoom Width KHz SensitivityAdvanced Advanced with QuadraBeam Plus transducer To change the 455 kHz Sensitivity settingAdvanced with WideSide transducer WideSide SensitivityDepth Lines Surface Clutter Max Depth Noise FilterWater Type Transducer Select Alarms Menu Tab Fish ID Alarm Depth AlarmLow Battery Alarm Aux. Temp. AlarmWith optional-purchase temp. probe or Temp/Speed only Alarm Tone Temp AlarmSetup Menu Tab Units Temp Units DepthUnits Distance International onlyUser Mode Units SpeedLanguage Restore Defaults Triplog ResetAdvanced, Sonar view only Select ReadoutsDefault Sonar View Customized Sonar View Aux. Temp. Offset Depth OffsetTemp Offset Speed CalibrationAdvanced, with Temp/Speed only Digits Format Nmea Output Views Menu Tab Accessory TestAccessories Menu Tab Series Doesn’t Power Up TroubleshootingProblem Possible Cause Display ProblemsIsolation Finding the Cause of NoiseSeries 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 Operating Frequency kHz and 83 kHz DualBeam Plus Specifications531524-1A 717 & 727 ManEng.qxp 9/30/2006 724 PM Sonar Terms Glossary531524-1A 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
Top Page Image Contents