Eagle Electronics 320 How Sonar Works, How to use this manual typographical conventions

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NOTICE!

The storage temperature range for your unit is from -4 degrees to +167 degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Extended stor- age in temperatures higher or lower than specified will damage the liq- uid crystal display in your unit. This type of damage is not covered by the warranty. For more information, contact the factory's Customer Service Department; phone numbers are listed on the last page.

How Sonar Works

Sonar has been around since the 1940s, so if you already know how it works, skip ahead to the next segment on the typographical conventions used in this manual. But, if you've never owned a sonar fish finder, this segment will tell you the under water basics.

Sonar is an abbreviation for SOund NAvigation and Ranging, a technol- ogy developed during World War II for tracking enemy submarines. A sonar consists of a transmitter, transducer, receiver and display. In simple terms, here's how it finds the bottom, or the fish:

The transmitter emits an electrical impulse, which the transducer con- verts into a sound wave and sends into the water. (The sound frequency can't be heard by humans or fish.) The sound wave strikes an object (fish, structure, bottom) and bounces back to the transducer, which converts the sound back into an electrical signal.

The receiver amplifies this return signal, or echo, and sends it to the display, where an image of the object appears on the scrolling sonar chart. The sonar's microprocessor calculates the time lapse between the transmitted signal and echo return to determine the distance to the object. The whole process repeats itself several times each second.

How to use this manual: typographical conventions

Many instructions are listed as numbered steps. The keypad and arrow "keystrokes" appear as boldface type. So, if you're in a real hurry (or just need a reminder), you can skim the instructions and pick out what menu command to use by finding the boldface command text. The fol-

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Contents FishMark 320 SeaFinder 320DF Page Table of Contents Fish I.D. Fish Symbols & Depths Read Me First How this manual can get you out on the water, fastGeneral Figuration and installation, bottom composi How to use this manual typographical conventions How Sonar WorksPage Page Transducer Installation PreparationsSingle-frequency transom installations Dual-frequency transom installationsSingle-frequency trolling motor installations Shoot-through hull installationsGood and poor transducer locations Transom Transducer centerline Hull bottom Transom Transducer Assembly and Mounting DotAlignment letters AlignmentPositions TransducerRatchets Bolt Flat washer Lock washer Nut Metal Nut Washer RubberWashers BoltTransom Flat-bottom hull Deep-vee hull BottomHull Internal tooth washer TMB-S bracket Bolt Nut Flat washer Partial fish arches Transducer aimedToo far back Full fish arch Proper transducer angleSHOOT-THRU-HULL Preparation Transducer location High speed Trolling speed Speed/Temperature Sensors Spread epoxy here Sand this surfaceSonar unit Rear viewGood location Power Connections Transom Bottom of hullOptional power off switch for Sonar unit Rear view Power/trans Power c able Accessory Transducer CableMounting the Unit Bracket, In-Dash or Portable Ducer socketFront 72.9 173.9 23.4 137.9 157.9 Millimeter 56.9 Inch146.5 113.5 Millimeters InchesCell battery Face CoverBasic Sonar Operation KeyboardPower/lights on and off Menus Main Menu Commands Sonar Menu Commands Pages Sonar Page, showing full sonar chart mode. bar graph Page Basic Sonar Quick Reference Sonar Operations Page To Restore Factory Settings Important TipPage Page Sonar Options & Other Features Alarms To adjust and turn on the zone alarm To adjust and turn on the shallow alarmTo adjust and turn on the deep alarm To turn the fish alarm on BrightnessChart Speed Calibrate SpeedDepth box ContrastDepth Cursor Depth Range Manual To switch to Manual Depth RangeDepth Range Automatic Fish I.D. Fish Symbols & Depths FasTrackTo turn Auto Depth Range on again Bar graphPage Page Symbols with FishTrack depths FishTrackFishReveal Press → ↓ to Fish ID DepthsentexitexitPage Frequency Change Transducer Frequency SeaFinder 320DF only Fish Not Visible Fish arch Fish archesGrayline Hard Fish near Grayline Hard Bottom Muddy bottomHyperScroll Noise RejectionOverlay Data Hard Muddy bottom bottom GraylineTo turn off displayed data To change displayed data font sizePing Speed & HyperScroll Page Reset Options Pop-up HelpSensitivity & Auto Sensitivity Reset Water DistanceScreen Contrast and Brightness Page Set Keel Offset Press MENUMENU↓ to SET Keel Offsetent Press MENUMENU↓ to Software Infoent Set LanguageSoftware Version Information Sonar Color Mode Sonar Chart Display OptionsPage Page Customizing the Digital Data/Chart Screen Stop Chart Sonar SimulatorSurface Clarity Press ↓ or ↑ to select clarity levelEXITEXITEXITUnits of Measure Zoom & Zoom BarZoom Pan Page Troubleshooting Page Noise Page Page Page Supplemental Material How to Obtain Service… Accessory Ordering Information for all countries Visit our web site
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320 specifications

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