Humminbird 937C DF COMBO, 937C COMBO To attach the pivot to the transducer Dual frequency unit

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	Level	15” (380 mm)
	Level	from prop(s)
		from prop(s)

To mount the transducer bracket to the boat (Dual frequency unit):

1.Remove the transducer mounting template from this manual. See Appendix B for the Dual Frequency Transducer Mounting Template.

2.Hold the template on the transom of the boat in the location where the transducer will be installed. Align the template vertically, matching the lower edge of the transom with the bottom corner of the template. If your propeller moves clockwise as the boat moves forward, mount the transducer on the starboard side, and use the bottom left corner of the template. If your propeller moves counter-clockwise as the boat moves forward, mount the transducer on the port side, and use the bottom right corner of the template.

5.Align the metal mounting bracket with the mounting holes. The center slot should be above the two outer slots. (This bracket and all other hardware supplied is top quality stainless steel for maximum strength and corrosion protection.) Insert the three 1" (25 mm) flat head wood screws into the drilled holes, but do not completely tighten.

Attaching the Bracket

To attach the pivot to the transducer (Dual frequency unit):

1.Attach the pivot to the transducer body, using the two 1/4"-20 x 5/8" (16 mm) machine screws, toothed washers, and square nuts. The toothed washers must fit on the inside of the transducer ears, between the pivot and the ears. The square nuts will be prevented from rotating by the pocket in the back of the pivot. An Allen wrench is provided which fits all the 1/4"-20 screws, but do not fully tighten the screws at this time.

		3
1	2	4
	2

3.Using a pencil or punch, mark the three mounting holes on the transom. Do not mark or drill any other holes at this time.

4.Using a 5/32" (4.0 mm) bit, drill the three holes to a depth of approximately 1" (25 mm). On fiberglass hulls, it is best to use progressively larger drill bits to reduce the chance of chipping or flaking the outer coating. Use a marine-grade silicone sealant to fill the drilled holes.

1 Insert the square nuts
2	Toothed Washer
3	Pivot	Attach the Pivot

4Machine Screw

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Contents Page Thank YOU Table of Contents Menu System Start-Up Options Menu Contact Humminbird Dualbeam Plus Sonar Series IntroductionHOW the 900 Series Works Single Beam SonarMulti-Media Card MMC/SD Slot MULTI-MEDIA Card MMC/SD Slot900 Series has a wide variety of configurations Accessory BUSInstallation Overview Accessory BusBasic installation tasks that you must perform include Control Head InstallationGimbal Mounting the Control Head Mounting Screws Washer Gimbal Mounting Bracket Cables Routed Near Mounting Bracket Back of Control Head IN-DASH Mounting the Control Head Temperature Plug Cable Connector Assembly to Back of Control HeadConnecting the Control Head Power Cable to the Boat Transducer InstallationRoute the transducer cable Transom Transducer InstallationTo determine transducer mounting location Determine transducer mounting locationMoves clockwise as the boat moves Corner of the templateNormal Cavitation Confirm that the pivot angle has not changedAttaching the Bracket To attach the pivot to the transducer Dual frequency unitForce is necessary to pivot the assembly Order to gain access to the mounting screws,To route the transom transducer cable all transducers Trial installation Inside the Hull Transducer InstallationDetermine the transducer mounting location Inside the Hull Permanently mount the transducerRoute the cable Make sure the position of the transducer is markedTest and Finish the Transducer Installation Trolling Motor Transducer InstallationFollow these steps to stem mount the GPS receiver Stem Mounting with AN Existing 1 14 Thread StemIf you have… Then use Hand-tighten onlyTo the cable as shown Access Under Mounting LocationFinish Routing the Cable and Check GPS Receiver Operation No Access Under Mounting LocationInstall the Speed accessory Speed Accessory InstallationHand tighten only Routing the speed cable to the control head Cleaning the Speed accessoryRotating Retaining Axial Clip to Remove Paddlewheel To test the installation Testing the System InstallationPowering UP the Control Head Getting Started Using Your 900 SeriesSeries 937c DF Combo Title Screen Triplog WHAT’S on the Sonar DisplayReal Time Sonar RTS Window Understanding Sonar HistoryBottom Presentation KEY Functions POWER/LIGHT KEYMARK/GOTO key Info key Zoom +/- key Fishing requirements see View Menu Tab View KEYMenu KEY WAY Cursor Control KEYMARK/GOTO KEY View Preset KeysExit KEY Info KEYNavigation views ViewsViews and Readouts Sonar viewsSonar Zoom View Sonar ViewSonar View Split Sonar View Sonar Zoom ViewBird’s Eye View BIRD’S EYE ViewChart View with Active Cursor Chart/Bird’s Eye Combo View1112 Chart/Sonar Combo ViewChart View with Cursor Present Chart OrientationNavigation Waypoints, Routes and Tracks To save the marked position as a waypointNavigate to a Waypoint or Position Chart View with Grid Chart View with TargetADD a Waypoint Target or Trolling Grid Save or Clear a Current Track Press Menu Menu SystemSTART-UP Options Menu Sonar Tab, Normal ModeStart-Up Options Menu Simulator Exit Normal operation by powering your 900 Series offNormal Operation SimulatorSelf Test Accessory TestSelf Test Accessory Test System StatusSonar X-PRESS Menu GPS Diagnostic ViewSensitivity Active SideSplit Position Lower Range To adjust the Upper RangeTo adjust the Lower Range Upper RangeSonar Colors Chart SpeedZoom Level Bottom LockNavigation X-Press Menu Highlight Split Position on the Navigation X-Press MenuClear Current Track Save Current TrackSave Current Route Remove Target Cancel NavigationRemove Grid Highlight Beam Select on the Sonar main menu Sonar Menu TABBeam Select To use Beam SelectTo turn Fish ID+ on or off To change the Fish ID Sensitivity settingFish ID+ Fish ID SensitivityTo change the Zoom Width To adjust the Bottom ViewBottom View Zoom WidthNoise Filter KHZ SensitivityDepth Lines Surface ClutterWater Type MAX DepthTransducer Select Color BAR Temperature GraphNavigation Menu TAB Routes TracksWaypoints Track MIN Distance North ReferenceTrolling Grid Rotation Trackpoint IntervalExport ALL NAV Data MAP DatumDelete ALL NAV Data To change the Map Borders setting Chart Menu TABChart Detail Level To change the Chart Detail Level settingSpot Soundings LAT/LON GridShaded Depth SET MAP Offset Alarms Menu TABClear MAP Offset Temp Alarm Depth AlarmFish ID Alarm LOW Battery AlarmTo change the Off Course Alarm setting OFF Course AlarmArrival Alarm Drift AlarmTo change the Alarm Tone setting Alarm ToneHighlight Alarm Tone on the Alarms main menu Units Depth Setup Menu TABTo change the Units Depth setting To change the Units Temp settingLanguage User ModeUnits Distance Units SpeedTo Restore Defaults Triplog ResetRestore Defaults To Reset TriplogTo Select Readouts Default Sonar View Customized Sonar ViewLocal Time Zone Depth OffsetTemp Offset Speed CalibrationPosition Format Daylight Saving TimeTo turn Nmea Output on or off Nmea OutputSonar Following Nmea sentences are outputHighlight the View main menu tab Accessories Menu TABViews Menu TAB To Change the View Status of Any ViewSeries Doesn’t Power Up TroubleshootingSeries Defaults to Simulator with a Transducer Attached Problem Possible Cause Display ProblemsBoat’s engine Finding the Cause of NoiseOther electronic devices Noise re-appearsHumminbird Service Policy Year Limited WarrantySeries Accessories Returning Your Unit for ServiceFor IN-WARRANTY service, complete the following steps Power Output SpecificationsPlace on bottom of hull Appendix aAlign with transom Appendix B Contact Humminbird