Humminbird 141c manual To adjust the Sensitivity, To adjust the Upper Range

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Sensitivity

Sensitivity controls how much detail is shown on the display and will adjust the sensitivity of all sonar frequencies. Increasing the sensitivity shows more sonar returns from small baitfish and suspended debris in the water; however, the display may become too cluttered. When operating in very clear water or greater depths, increased sensitivity shows weaker returns that may be of interest. Decreasing the sensitivity eliminates the clutter from the display that is sometimes present in murky or muddy water. If Sensitivity is adjusted too low, the display may not show many sonar returns that could be fish.

Sensitivity at Low

Sensitivity at Medium

Sensitivity at High

To adjust the Sensitivity:

1.Highlight Sensitivity on the Sonar X-PressTMMenu.

2.Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the Sensitivity setting. (Low = 1, High = 20, Default = 10)

Upper Range

(Advanced: Sonar, Split Sonar, Big Digits and Circular Flasher Views only)

Upper Range sets the shallowest depth range that will be displayed on the Sonar, Split Sonar, Big Digits and Circular Flasher views. The Upper Range menu choice is available when User Mode is set to Advanced (see Setup Menu Tab: User Mode) and can only be accessed from the Sonar, Split Sonar, Big Digits and Circular Flasher views. Upper Range is often used with Lower Range.

For example, if you are only interested in the area between 20 and 50 feet deep, you should set the Upper Depth Range to 20 and the Lower Depth Range to 50. The Sonar View will then show the 30 foot area between 20 and 50, and will not show the surface or the bottom (assuming the bottom is deeper than 50 feet), and will show greater detail for that area between 20 and 50 feet.

NOTE: A minimum distance of 10 feet will be maintained between the Upper and Lower Range regardless of the manual settings entered.

To adjust the Upper Range:

1.Make sure you are in Advanced Mode, then highlight Upper Range on the Sonar X-PressTMMenu.

2.Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the Upper Range setting. (0 to 590 feet or 0 to 237 meters [International Models only], Default = 0)

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Contents 141c Operations Manual Table of Contents Thank YouTable of Contents Single Beam Sonar Peak to Peak measures power output at the highest pointsHow Sonar Works What’s On the Display High Sonar Intensity Return Bait BallSonar View Zoom View Big Digits View Circular Flasher View ViewsSonar View Sonar ViewBottom Presentation Understanding Sonar HistoryReal Time Sonar RTS Window Sonar Zoom View Sonar Zoom ViewKey Functions POWER/LIGHT KeyBig Digits View Circular Flasher ViewExit Key Menu KeyWAY Cursor Control Key Owering Up the UnitPress TM Menu Sonar Tab, Normal Mode Sonar Tab, Advanced ModeMenu System Simulator Start-Up Options MenuNormal Operation Conduct a unit self-test Accessory TestSystem Status Sonar X-Press TM Menu StatusSensitivity To adjust the SensitivityTo adjust the Upper Range Upper RangeZoom Level Chart SpeedLower Range Bottom Range To adjust the Bottom RangeBottom Lock Sonar Menu TabFish ID+TM To change the Fish ID Sensitivity settingTo change the RTS Window setting Fish ID SensitivityDepth Lines Bottom ViewZoom Width Max Depth Surface ClutterNoise Filter Alarms Menu Alarms Menu TabTo change the Water Type setting Water TypeLow Battery Alarm Depth AlarmFish ID Alarm Temp AlarmTo change the Alarm Tone setting Alarm ToneSetup Menu Tab Highlight Alarm Tone on the Alarms main menuUnits Temp User ModeUnits Depth Units DistanceSelect Views Triplog ResetRestore Defaults Temp Offset Select ReadoutsDepth Offset Speed Calibration TroubleshootingTo change the Speed Calibration setting Advanced, with Temp/Speed onlyControl head loses power at high speeds Display ProblemsProblem Possible Cause Finding the Cause of NoiseSonar Terms SpecificationsGlossary 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