Humminbird 981 Fish ID Sensitivity, To turn Fish ID+ on or off, Transducer Cone and Fish Arches

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200 kHz, Narrow Beam	50 kHz, Wide Beam
Orange Fish Symbols	Blue Fish Symbols

When Fish ID+™ is turned off, the 900 Series™ shows only the raw sonar returns on the display. These returns will often result in "arches" forming on the display, indicating potential targets. Due to the transducer beam angle, the distance to a fish decreases as the fish moves into the beam, and then increases as it moves out again, creating a Fish Arch when this distance change is shown on the display. Boat speed, chart speed, and the position of the fish within the sonar beam greatly affect the shape of the arch.

Transducer Cone and Fish Arches

To turn Fish ID+™ on or off:

1.Highlight Fish ID+ on the Sonar main menu.

2.Use the LEFT or RIGHT 4-WAY Cursor Control keys to turn the Fish ID+™ setting On or Off. (Off, On, Default = Off)

FISH ID SENSITIVITY

Fish ID Sensitivity adjusts the threshold of the Fish ID+™ detection algorithms. Selecting a higher setting allows weaker returns to be displayed as fish. This is useful for identifying smaller fish species or baitfish. Selecting a lower setting displays fewer fish from weak sonar returns. This is helpful when seeking larger species of fish. Fish Sensitivity is used in conjunction with Fish ID+™. Fish ID+™ must be On for Fish Sensitivity to affect the ability of the 900 Series™ to identify sonar returns as fish.

To change the Fish ID Sensitivity setting:

1.Highlight Fish ID Sensitivity on the Sonar main menu.

2.Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Fish Sensitivity setting. (Low = 1, High = 10, Default = 5)

REAL TIME SONAR (RTS®)

WINDOW

RTS® Window sets the RTS® Window to either Wide or Narrow, or turns it off in the Sonar View. The RTS® Window always updates at the fastest rate possible and only displays returns that are within the transducer beam. (See Getting Started - Using Your 900 Series™: Real Time Sonar [RTS®] Window for more information.)

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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