Humminbird 141c Understanding Sonar History, Real Time Sonar RTS Window, Bottom Presentation

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Understanding Sonar History

It is important to understand the significance of the 100 Series™ Fishing System display. The display does NOT show a literal 3-dimensional representation of what is under the water. Each vertical band of data received by the control head and plotted on the display represents something that was detected by a sonar return at a particular time. As both the boat and the targets (fish) may be moving, the returns are only showing a particular segment of time when objects were detected, not exactly where those objects are in relation to other objects shown on the display.

Real Time Sonar (RTS®) Window

A Real Time Sonar (RTS®) Window appears on the right side of the display in the Sonar View only. The RTS® Window always updates at the fastest rate possible for depth conditions and shows only the returns from the bottom, structure and fish that are within the transducer beam. The RTS® Window plots the depth and intensity of a sonar return (see Sonar Menu - RTS® Window).

Bottom Presentation

As the boat moves, the unit charts the changes in depth on the display to create a profile of the Bottom Contour. The type of bottom can be determined from the return charted on the display. A Hard Bottom such as compacted sediment or flat rock appears as a thinner line across the display. A Soft Bottom such as mud or sand appears as a thicker line across the display. Rocky Bottoms have a broken, random appearance.

Bottom Contour Profile with RTS® Window.

Temp/Speed Accessory is optional.

Hard Bottom

Soft Bottom

Rocky Bottom

The Narrow RTS® Window indicates the sonar intensity through the use of colors. Red indicates a strong return and blue indicates a weak return. The depth of the sonar return is indicated by the vertical placement of the return on the display depth scale.

The Wide RTS® Window indicates the sonar intensity through the use of a bar graph. The length of the plotted return provides an indication of whether the return is weak or strong. The depth of the sonar return is indicated by the vertical placement of the return on the display depth scale.

The sonar returns from the bottom, structure and fish can be represented as either WhiteLine® or Structure ID®. See Sonar Menu Tab: Bottom View for details on how to set the bottom view.

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Contents 141c Operations Manual Thank You Table of ContentsTable of Contents How Sonar Works Peak to Peak measures power output at the highest pointsSingle Beam Sonar High Sonar Intensity Return Bait Ball What’s On the DisplaySonar View ViewsSonar View Sonar View Zoom View Big Digits View Circular Flasher ViewReal Time Sonar RTS Window Understanding Sonar HistoryBottom Presentation Sonar Zoom View Sonar Zoom ViewCircular Flasher View POWER/LIGHT KeyBig Digits View Key FunctionsOwering Up the Unit Menu KeyWAY Cursor Control Key Exit KeyMenu System Sonar Tab, Normal Mode Sonar Tab, Advanced ModePress TM Menu Normal Operation Start-Up Options MenuSimulator Status Accessory TestSystem Status Sonar X-Press TM Menu Conduct a unit self-testUpper Range To adjust the SensitivityTo adjust the Upper Range SensitivityLower Range Chart SpeedZoom Level Sonar Menu Tab To adjust the Bottom RangeBottom Lock Bottom RangeFish ID Sensitivity To change the Fish ID Sensitivity settingTo change the RTS Window setting Fish ID+TMZoom Width Bottom ViewDepth Lines Noise Filter Surface ClutterMax Depth Water Type Alarms Menu TabTo change the Water Type setting Alarms MenuTemp Alarm Depth AlarmFish ID Alarm Low Battery AlarmHighlight Alarm Tone on the Alarms main menu Alarm ToneSetup Menu Tab To change the Alarm Tone settingUnits Distance User ModeUnits Depth Units TempRestore Defaults Triplog ResetSelect Views Depth Offset Select ReadoutsTemp Offset Advanced, with Temp/Speed only TroubleshootingTo change the Speed Calibration setting Speed CalibrationFinding the Cause of Noise Display ProblemsProblem Possible Cause Control head loses power at high speedsGlossary SpecificationsSonar Terms 531442-1A141cEng.qxd 11/15/2005 840 PM Receiver See Transmitter 531442-1A141cEng.qxd 11/15/2005 840 PM 531442-1A141cEng.qxd 11/15/2005 840 PM Contact Humminbird
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