Humminbird 981 manual Understanding Side Imaging

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98x_Manual_531376-1_A.qxd 2/23/2005 11:40 AM Page 32

WhiteLine® highlights the strongest sonar returns in white, resulting in a distinctive outline. This has the benefit of clearly defining the bottom on the display.

UNDERSTANDING SIDE IMAGING

It is important to understand how Side Imaging technology produces the display available on the 900 Series™. The images you see on the display are produced using sonar technology. The special transducer produces three distinct beams – one beam facing down and two beams pointing out to the side. These “side beams” are aimed at right angles to the path of the boat and, unlike the “down beam” which provide conical coverage, the side beams provide coverage which is very thin front to back, yet very wide top to bottom.

The narrow aspect (front to back) of the beam illuminates a small strip of the bottom perpendicular to the direction of the boat. Each time the unit “pings”, a strip of data representing all the echoes received by the transducer, are put together on the display to form the image that you see. The rows closest to the boat icon at the top of the display are the most recent sonar data. The information is scrolled down the screen as new data, drawn at the top of the screen, becomes available.

262 kHz provides maximum coverage with 180° total beam width

	Side Imaging
	262 kHz - Maximum Coverage
84o	20o	84o
262 kHz	20o	262 kHz
	200 kHz

74o

50 kHz

180º Total Coverage

The side beams can be operated at one of two frequencies: 262 kHz or 455 kHz. Selecting 455 kHz produces the sharpest image while selecting 262 kHz provides greater bottom coverage area. It is important to understand that when the boat turns, the strips to one side will begin to overlap and the strips on the other side will fan out, providing some distortion to the image. Side beams look out 240 feet, with a depth limitation of 100 to 150 feet, depending on the contour of the bottom. Please see the Side Imaging Sonar Tutorial at www.humminbird.com for a more detailed explanation.

Your Side Imaging transducer also provides traditional sonar imaging at 50/200 kHz. Total coverage under the boat is 180°.

455 kHz provides highest resolution with 160° total beam width

Side Imaging

	40o	20o	40o
		74o 200 kHz
	455 kHz		455 kHz

50 kHz

160º Total Coverage

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Contents 98xManual531376-1A.qxd 2/23/2005 1139 AM Thank You Table of Contents Menu System Start-Up Options Menu Sonar X-Press MenuSide Imaging X-Press Menu Sonar Menu TabAlarms Menu Tab Setup Menu TabViews Menu Tab Accessories Menu Tab Troubleshooting Contact HumminbirdSeries Introduction HOW the 900 Series WorksSide Imaging Sonar Dualbeam Plus SonarMULTI-MEDIA Card MMC/SD Slot Multi-Media Card MMC/SD SlotAccessory Bus Accessory BUSInstallation Overview Control Head Installation 900 Series has a wide variety of configurationsGimbal Mounting the Control Head Mounting Screws Washer Gimbal Mounting Bracket Cables Routed Near Mounting Bracket Speed Communications Transducer Cable Collector InsertIN-DASH Mounting the Control Head Parts and tools specific to In-dash mounting areIn-dash mounting foam pads In-dash mounting template23/2005 Connecting the Control Head Power Cable to the Boat Beginning of this procedureMotor Position Transducer InstallationTransom Transducer Trolling Motor Transducer Transom Transducer Installation Stepped HullWithout deadrise adjustment Not a hull, motor, or other transducer, etcCompletely tighten Be fully tightened until all adjustments are madeHeaded pin can be inserted from either side of the bracket Force is necessary to pivot the assembly Normal CavitationTrolling Motor Transducer Installation Test and Finish the Transducer Installation Hand-tighten onlyFollow these steps to stem mount the GPS receiver To the cable as shownAccess Under Mounting Location Access Under Mounting LocationNo Access Under Mounting Location Speed Accessory Installation Finish Routing the Cable and Check GPS Receiver OperationInstall the Speed accessory Hand tighten onlyTesting the System Installation Rotating Retaining Axial Clip to Remove PaddlewheelPowering UP the Control Head Getting Started Using Your 900 SeriesWHAT’S on the Sonar Display TriplogSonar Bottom Presentation Understanding Sonar HistoryReal Time Sonar RTS Window KHz provides maximum coverage with 180 total beam width KHz provides highest resolution with 160 total beam widthUnderstanding Side Imaging WHAT’S on the Side Imaging Display Topography Changes Bottom Return TriplogSide Imaging Representation Side Imaging Technology HOW IT WorksSide Imaging on the Water Interpretation Submerged Ravine with Timber Submerged Standing and Fallen Timber, Plus Bait Fish Submerged Swimming PoolPOWER/LIGHT KEY KEY FunctionsView KEY Menu KEYView Preset Keys WAY Cursor Control KEYExit KEY Info KEYViews MARK/GOTO KEYViews available on your 900 Series are Sonar viewsSonar View Views and ReadoutsSonar View Sonar Zoom View Sonar Zoom ViewSplit Sonar View Side Imaging ViewSplit Sonar View Side Imaging ViewSIDE/SONAR Combo View Side/Sonar Combo ViewChart/Bird’s Eye Combo View Bird’s Eye ViewChart View with Active Cursor Chart/Sonar ViewCHART/SIDE Combo View Chart/Side Combo ViewChart View with Cursor Present NavigationWAYPOINTS, Routes and Tracks Waypoints, Routes and TracksNavigate to a Waypoint or Position ADD a Waypoint Target or Trolling Grid Chart View with TargetChart View with Grid SAVE, Edit or Delete a Route Menu System Press MenuSonar Tab, Normal Mode Sonar Tab, Advanced Mode START-UP Options MenuNormal Simulator System Status Start-Up Options MenuSelf Test Accessory Test GPS Diagnostic View Normal OperationSimulator System StatusGPS Diagnostic View Accessory TestAccessory Test Screen To Adjust Split Screen Position Sonar X-PRESS MenuActive Side Split PositionTo adjust the Sensitivity To adjust the Upper RangeSensitivity Upper RangeZoom Level Chart SpeedLower Range Sonar Colors Bottom LockBottom Range Side Imaging X-Press Menu Highlight Split Position on the Side Imaging X-Press MenuSide Imaging Views only SI Range SI SideSI Sensitivity SI Colors Navigation X-PRESS MenuTo change the SI Colors Highlight SI Colors on the Side Imaging X-PressmenuSave Current Track Clear Current TrackTo Save Current Track To Clear Current TrackCancel Navigation Save Current RouteSkip Next Waypoint Remove TargetRemove Grid Sonar Menu TABTo Remove a Grid Only if a Grid is activeFish ID+ Beam SelectSide View Frequency To change the Fish ID Sensitivity setting Fish ID SensitivityTo turn Fish ID+ on or off Highlight Fish ID Sensitivity on the Sonar main menuTo change the RTS Window setting To adjust the Bottom ViewBottom View Zoom WidthKHZ Sensitivity Depth LinesSurface Clutter Noise FilterColor BAR MAX DepthWater Type Temperature Graph To change the display of the Temperature GraphSonar View only, with Temperature input Navigation Menu TABRoutes TracksWaypoints Chart Orientation North ReferenceTrolling Grid Rotation Trackpoint IntervalTrack MIN Distance MAP DatumExport ALL NAV Data Delete ALL NAV DataChart Menu TAB Chart Detail LevelTo change the Chart Detail Level setting MAP BordersLAT/LON Grid Spot SoundingsShaded Depth SET Simulation PositionAlarms Menu TAB To change the Map Offset settingSET MAP Offset Clear MAP OffsetDepth Alarm Fish ID AlarmLOW Battery Alarm Temp AlarmDrift Alarm OFF Course AlarmArrival Alarm Alarm Tone Setup Menu TABTo change the Alarm Tone setting Highlight Alarm Tone on the Alarms main menuUnits Depth Units TempUnits Distance Units SpeedUser Mode Triplog ResetRestore Defaults LanguageDefault Sonar View Select ReadoutsTo change the Depth Offset setting To change the Temp Offset settingDepth Offset Temp OffsetSpeed Calibration Local Time ZoneDaylight Saving Time Position FormatNmea Output Time FormatDate Format Views Menu TAB To turn Sonar on or offFollowing views are available To Change the View Status of Any ViewAccessories Menu TAB TroubleshootingSeries Doesn’t Power Up Series Defaults to Simulator with a Transducer AttachedDisplay Problems Control head loses power at high speedsFinding the Cause of Noise Other electronic devicesNoise re-appears Boat’s engineYear Limited Warranty Humminbird Service PolicyFor IN-WARRANTY service, complete the following steps Returning Your Unit for ServiceSeries Accessories Specifications Area of CoverageAppendix a Transducer Mounting Template XHS-9-SI-160-TContact Humminbird