Humminbird 737 GPS 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.

NOTE: The Sensitivity setting is a global setting and will adjust the sensitivity of all sonar frequencies, as compared to specific sensitivity adjustments (such as 83 kHz Sensitivity, 455 kHz Balance or Wideside Sensitivity) that allow you to adjust the level of sensitivity for one specific beam at a time.

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 1490 feet or 0 to 497 meters [International Models Only], Default = 0)

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Contents Atic Thank You Table of ContentsKey Functions Views Menu Tab Accessories Menu Tab How Sonar Works Peak to Peak measures power output at the highest pointsDualBeam Plus Sonar QuadraBeam SonarWideSide Sonar With optional-purchase WideSide transducerHow GPS and Cartography Work Software UpdatesMulti-Media Card MMC/SD Slot With optional-purchase GPS ReceiverWhat’s On the Display 83 kHz, Wide Beam Hollow Fish SymbolSoft Bottom RTS Real Time Sonar Window Sonar View ViewsSonar views Real Time Sonar RTS Window Understanding Sonar HistoryBottom Presentation Freeze FrameSonar Zoom View Sonar Zoom ViewBig Digits View 200/83 kHz Split Sonar ViewCircular Flasher View Big Digits View 200/83 kHz Split Sonar ViewSide Beam View Screen Snapshot ViewMaking a Screen Snapshot Screen Capture ViewBird’s Eye View WideSide ViewChart View with Active Cursor Chart View without Active CursorCombo View DepthWaypoints, Routes and Tracks Viewing CartographySave, Edit, or Delete a Waypoint Add a Waypoint Target or Trolling Grid Chart View with GridKey Functions POWER/LIGHT KeyView Key Info KeyWAY Cursor Control Key Accessory BusMark Key Goto KeyMenu System Powering Up the UnitPresence or absence of a transducer Normal Operation Start-Up Options Menu System Status SimulatorExit PC Connect mode by powering the Fishing System off Accessory TestGPS Diagnostic View Sonar X-PressTMMenu To adjust the SideSide WideSide transducer WideSide view onlyTo adjust the Upper Range To adjust the SensitivitySensitivity Upper RangeLower Range Chart SpeedSide Beam Range Bottom View Cancel NavigationBottom Range Bottom LockWaypoint Name Navigation X-PressTM MenuOnly with an active cursor on a waypoint To view the Waypoint Name SubmenuSave Current Track Cursor to WaypointClear Current Track Save Current RouteRemove Grid Remove TargetSonar Window Delete Image Screen Snapshot X-Press TM MenuDelete All Images Sonar Menu TabFish ID+TM Beam SelectTo use Beam Select Highlight Beam Select on the Sonar main menuZoom Width Fish ID SensitivityKHz Sensitivity AdvancedWideSide Sensitivity KHz BalanceDepth Lines Advanced with WideSide transducerNoise Filter Surface ClutterMax Depth Water Type To change the Water Type settingTransducer Select Navigation Menu TabSaved Tracks Current TrackWaypoints Routes Chart OrientationNorth Reference Grid RotationMap Datum Track Min DistanceCourse Projection Line Export All Nav DataChart Detail Level Chart Menu TabMap Borders With optional-purchase GPS Receiver onlySpot Soundings Lat/Lon GridSet Simulation Position Set Map OffsetDepth Alarm Alarms Menu TabFish ID Alarm To change the Depth Alarm settingTemp Alarm Low Battery AlarmOff Course Alarm Arrival AlarmAlarm Tone Drift AlarmSetup Menu Tab To change the Drift Alarm settingUnits Depth User ModeUnits Temp Units DistanceRestore Defaults Triplog ResetSelect Readouts Advanced, Sonar view onlyTemp Offset Depth OffsetSpeed Calibration Position FormatDate Format Time FormatNmea Output SonarUsing Screen Snapshot Accessories Menu TabViews Menu Tab To Change the View Status of Any ViewTo make a screen snapshot Screen Snapshot must be enabled TroubleshootingTo view screen snapshots Finding the Cause of Noise Display ProblemsSpecifications Series Fishing System AccessoriesSonar Terms Glossary100 102 Receiver See Transmitter104 GPS & Navigation Terms 108 Contact Humminbird
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