Humminbird 981 manual Series Introduction, HOW the 900 Series Works, Side Imaging Sonar

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900 SERIES™ INTRODUCTION

Your 900 Series™ Ultra Wide Screen Fishing System comes in several different configurations. See the following list of products, all of which are covered by this manual, to find your 900 Series™ configuration:

NOTE: Only the 987c SI Combo model comes with GPS and built-in cartography.

Humminbird® 981c SI: Ultra-Wide Screen Fishing System with Side Imaging and Dual Frequency Transducer, optional GPS support

Humminbird® 987c SI Combo: Ultra-Wide Screen Fishing System with Chartplotter (Maps) and Side Imaging and Dual Frequency Transducer, GPS Receiver included.

HOW THE 900 SERIES™ WORKS

Sonar technology is based on sound waves. The 900 Series™ Fishing System uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer. Your 900 Series™ Fishing System sends a sound wave signal and determines distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off of an object; it then uses the reflected signal to interpret location, size, and composition of an object. Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back again in less than ¼ of a second. It is unlikely that your boat can "outrun" this sonar signal.

SIDE IMAGING SONAR

Your 900 Series™ 987c SI Combo and 981c SI use Side Imaging sonar to provide a wide yet precise survey of a large area of water, including detailed bottom topography and fish-attracting structure orientation. The Side Imaging transducer returns are processed into an image similar to an aerial photograph. Typically, the Side Imaging sonar searches an area that is 240 feet wide, with a depth limitation of 100 feet. See What’s on the Side Imaging Display and Understanding Side Imaging for more information.

DUALBEAM PLUS™ SONAR

Your 900 Series™ is shipped with a 200/50 kHz DualBeam PLUS™ sonar system with a wide (74°) area of coverage. DualBeam PLUS™ sonar returns can be blended together, viewed separately or compared side-by-side. DualBeam PLUS™ is ideal for a wide range of conditions - from shallow to very deep water in both fresh and salt water. Depth capability is affected by such factors as boat speed, wave action, bottom hardness, water conditions and transducer installation.

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Contents 98xManual531376-1A.qxd 2/23/2005 1139 AM Thank You Table of Contents Sonar Menu Tab Menu System Start-Up Options MenuSonar X-Press Menu Side Imaging X-Press MenuSetup Menu Tab Alarms Menu TabContact Humminbird Views Menu Tab Accessories Menu Tab TroubleshootingDualbeam Plus Sonar Series IntroductionHOW the 900 Series Works Side Imaging SonarMulti-Media Card MMC/SD Slot MULTI-MEDIA Card MMC/SD SlotInstallation Overview Accessory BUSAccessory Bus 900 Series has a wide variety of configurations Control Head InstallationGimbal Mounting the Control Head Mounting Screws Washer Gimbal Mounting Bracket Speed Communications Transducer Cable Collector Insert Cables Routed Near Mounting BracketIn-dash mounting template IN-DASH Mounting the Control HeadParts and tools specific to In-dash mounting are In-dash mounting foam pads23/2005 Beginning of this procedure Connecting the Control Head Power Cable to the BoatTransom Transducer Trolling Motor Transducer Transducer InstallationMotor Position Stepped Hull Transom Transducer InstallationNot a hull, motor, or other transducer, etc Without deadrise adjustmentHeaded pin can be inserted from either side of the bracket Be fully tightened until all adjustments are madeCompletely tighten Normal Cavitation Force is necessary to pivot the assemblyTrolling Motor Transducer Installation Hand-tighten only Test and Finish the Transducer InstallationTo the cable as shown Follow these steps to stem mount the GPS receiverNo Access Under Mounting Location Access Under Mounting LocationAccess Under Mounting Location Finish Routing the Cable and Check GPS Receiver Operation Speed Accessory InstallationHand tighten only Install the Speed accessoryRotating Retaining Axial Clip to Remove Paddlewheel Testing the System InstallationGetting Started Using Your 900 Series Powering UP the Control HeadTriplog WHAT’S on the Sonar DisplayReal Time Sonar RTS Window Understanding Sonar HistorySonar Bottom Presentation Understanding Side Imaging KHz provides highest resolution with 160 total beam widthKHz provides maximum coverage with 180 total beam width Topography Changes Bottom Return Triplog WHAT’S on the Side Imaging DisplaySide Imaging on the Water Interpretation Side Imaging Technology HOW IT WorksSide Imaging Representation Submerged Ravine with Timber Submerged Swimming Pool Submerged Standing and Fallen Timber, Plus Bait FishMenu KEY POWER/LIGHT KEYKEY Functions View KEYInfo KEY View Preset KeysWAY Cursor Control KEY Exit KEYSonar views ViewsMARK/GOTO KEY Views available on your 900 Series areSonar View Views and ReadoutsSonar View Sonar Zoom View Sonar Zoom ViewSide Imaging View Split Sonar ViewSide Imaging View Split Sonar ViewSide/Sonar Combo View SIDE/SONAR Combo ViewBird’s Eye View Chart/Bird’s Eye Combo ViewChart/Sonar View Chart View with Active CursorChart/Side Combo View CHART/SIDE Combo ViewNavigation Chart View with Cursor PresentWaypoints, Routes and Tracks WAYPOINTS, Routes and TracksNavigate to a Waypoint or Position Chart View with Grid Chart View with TargetADD a Waypoint Target or Trolling Grid SAVE, Edit or Delete a Route Press Menu Menu SystemStart-Up Options Menu Sonar Tab, Normal Mode Sonar Tab, Advanced ModeSTART-UP Options Menu Normal Simulator System StatusSystem Status Self Test Accessory Test GPS Diagnostic ViewNormal Operation SimulatorAccessory Test Screen Accessory TestGPS Diagnostic View Split Position To Adjust Split Screen PositionSonar X-PRESS Menu Active SideUpper Range To adjust the SensitivityTo adjust the Upper Range SensitivityLower Range Chart SpeedZoom Level Bottom Range Bottom LockSonar Colors Side Imaging Views only Highlight Split Position on the Side Imaging X-Press MenuSide Imaging X-Press Menu SI Sensitivity SI SideSI Range Highlight SI Colors on the Side Imaging X-Pressmenu SI ColorsNavigation X-PRESS Menu To change the SI ColorsTo Clear Current Track Save Current TrackClear Current Track To Save Current TrackRemove Target Cancel NavigationSave Current Route Skip Next WaypointOnly if a Grid is active Remove GridSonar Menu TAB To Remove a GridSide View Frequency Beam SelectFish ID+ Highlight Fish ID Sensitivity on the Sonar main menu To change the Fish ID Sensitivity settingFish ID Sensitivity To turn Fish ID+ on or offZoom Width To change the RTS Window settingTo adjust the Bottom View Bottom ViewNoise Filter KHZ SensitivityDepth Lines Surface ClutterWater Type MAX DepthColor BAR Navigation Menu TAB Temperature GraphTo change the display of the Temperature Graph Sonar View only, with Temperature inputWaypoints TracksRoutes Trackpoint Interval Chart OrientationNorth Reference Trolling Grid RotationDelete ALL NAV Data Track MIN DistanceMAP Datum Export ALL NAV DataMAP Borders Chart Menu TABChart Detail Level To change the Chart Detail Level settingSET Simulation Position LAT/LON GridSpot Soundings Shaded DepthClear MAP Offset Alarms Menu TABTo change the Map Offset setting SET MAP OffsetTemp Alarm Depth AlarmFish ID Alarm LOW Battery AlarmArrival Alarm OFF Course AlarmDrift Alarm Highlight Alarm Tone on the Alarms main menu Alarm ToneSetup Menu TAB To change the Alarm Tone settingUnits Speed Units DepthUnits Temp Units DistanceLanguage User ModeTriplog Reset Restore DefaultsSelect Readouts Default Sonar ViewTemp Offset To change the Depth Offset settingTo change the Temp Offset setting Depth OffsetPosition Format Speed CalibrationLocal Time Zone Daylight Saving TimeDate Format Time FormatNmea Output To Change the View Status of Any View Views Menu TABTo turn Sonar on or off Following views are availableSeries Defaults to Simulator with a Transducer Attached Accessories Menu TABTroubleshooting Series Doesn’t Power UpControl head loses power at high speeds 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 Area of Coverage SpecificationsTransducer Mounting Template XHS-9-SI-160-T Appendix aContact Humminbird