Garmin Fishfinder 340C Owner's Manual
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Garmin Fishfinder 340C Owner's Manual

Garmin fish finder user manual
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Owner's Manual
Fishfinder 340C
full-featured color sonar

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Summary of Contents for Garmin Fishfinder 340C

  • Page 1 Owner’s Manual Fishfinder 340C full-featured color sonar...
  • Page 2 Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other Garmin products.

  • Page 3: About This Manual

    Fishfinder 340C Owner’s Manual ntroductIon About This Manual To get the most out of your Fishfinder 340C, read this manual and learn the operating procedures. This manual includes the following: • Introduction—contains the Table of Contents, product registration, contact, and cleaning information.

  • Page 4: Table Of Contents

    Testing the Installation... 20 Using the Fishfinder 340C ...21 Learning the Basic Functions ... 21 Using the Fishfinder 340C Keypad ... 22 Understanding the Main Pages ... 23 Using the Main Menu ... 26 Using the Adjustment Menu ... 34 Configuring Advanced Data Fields ...

  • Page 5: Product Registration

    Apply eyeglass lens cleaner to a clean, lint-free cloth, and then gently wipe the screen with the moistened cloth. CAUTION: The Fishfinder 340C lens is coated with a special anti-reflective coating which is very sensitive to skin oils, waxes, and abrasive cleaners. CLEANERS CONTAINING AMMONIA HARM THE ANTI-REFLECTIVE COATING.

  • Page 6: Warning

    Failure to avoid the following potentially hazardous situations could result in an accident or collision resulting in death or serious injury: When navigating, carefully compare information displayed on the Fishfinder 340C to all available navigation sources, including information from visual sightings, and maps.

  • Page 7: Getting Started

    Before installing and using your Fishfinder 340C, check to see that your package includes the following items. The package number is on the outside of the box. If any parts are missing, contact your Garmin dealer immediately. Packing List Standard Package (010-00505-00) •...

  • Page 8: Understanding The Fishfinder And Sonar

    IshfInder And Understanding the Fishfinder and Sonar The Fishfinder 340C is a fully automatic, color sonar unit that allows you to go out on the water and find fish without having to configure a lot of settings. However, you can customize each setting as you prefer.

  • Page 9: Using Dual Beam

    Fishfinder screen. We recommend that you take your Fishfinder out on familiar water, and spend time learning to interpret what you see on the Fishfinder 340C screen. Think of the Fishfinder screen as if you took a picture from the side of an aquarium in your home.
  • Page 10 The bottom is the continuous, intensely-colored line running across the bottom of the screen. The Fishfinder 340C includes the latest technology in interpreting bottom signals; it can see through fish, structures, and thermoclines (shown in the weakest colors). Large schools of fish or dense structures close to the bottom can affect water depth return readings.

  • Page 11: Installing The Fishfinder 340C

    IshfInder To ensure the successful operation of your Fishfinder 340C, you must properly install the Fishfinder and all of its related parts. To install and use your Fishfinder, you must do the following: 1. Select a proper location for the Fishfinder. 2. Mount the Fishfinder. 3. Install your transducer.

  • Page 12: Mounting The Fishfinder

    • You can flush mount the Fishfinder into a flat panel. Surface Mounting the Fishfinder The Fishfinder 340C’s compact, waterproof case is suitable for mounting in exposed locations or at the nav station. The Fishfinder comes with a tilt/swivel mounting bracket that can be used for console or overhead mounting.
  • Page 13 IshfInder Flush Mounting the Fishfinder You can flush mount the Fishfinder 340C into a flat panel. • Select an appropriately sized location for the unit. • Use the Flush Mount Template provided in the box to determine a location.
  • Page 14 IshfInder ountIng the To flush mount the Fishfinder 340C: 1. Trim the Flush Mount Template, and tape it to the chosen location. 2. Using a center punch, indent the center of each mounting hole location. 3. Using an 1/8" (3 mm) drill bit, drill the four mounting holes. 4. Using a 3/8" (6 mm) drill bit, drill a hole for a location to begin cutting the mounting surface. 5. Using the jig saw, cut the mounting surface along the inside of the dashed line indicated on the template. Be very careful when cutting this hole, there is only a small amount of clearance between the Fishfinder and the mounting holes. You can cut slightly inside the indicated line and then sand or file the panel, as needed, to obtain the best fit. 6. Install the four mounting studs into the Fishfinder by screwing the shorter section into the back of the Fishfinder. Use a 1/16" (2 mm) Allen wrench to tighten the mounting studs until the stop contacts the case. Be careful not to overtighten, because this can damage the mounting stud! The studs have a reusable thread-locking patch pre-applied from the factory. 7. Place the Fishfinder into the cut out in the mounting surface. IshfInder 8. Place washers over the mounting studs, and then thread...

  • Page 15: Mounting The Transducer

    Proper transducer installation is key to getting the best performance from your new Fishfinder. If the transducer lead is too short, extension cables are available from your Garmin dealer. Coil and secure any excess cable. DO NOT cut the transducer lead or any part...

  • Page 16: Mounting The Transducer On A Trolling Motor

    2. Position the mount gasket on the curved top of the transducer mount. Cable tie Front of the transducer rAnsducer 3. Place the transducer assembly against the motor body of the trolling motor, with the front of the transducer pointed away from the trolling motor propeller. 4. Wrap the two ends of the cable tie around the motor body. Place the pointed end of the cable tie through the fastener hole on the opposite end and pull it through until it is snug but not tight. (The cable tie clicks when you pull it.) 5. Position the transducer so that it is parallel with the bottom when in use, and make sure the gasket is aligned properly. Pull the cable tie end until tight. Trim off the excess if necessary. Tighten the 10-32 locking nut until it touches the mounting bracket, and then tighten 1/4 turn more. (Do not overtighten.) 6. Route the 30-foot (9 m) transducer cable using the supplied cable ties to secure the cable to the motor shaft. You can fill the forward-facing portion (except the cable tie pocket) of the transducer mount with sealant to avoid accumulating debris. Fishfinder 340C Owner’s Manual...

  • Page 17: Mounting The Transducer On A Transom

    The transducer can cause cavitation that can degrade the boat’s performance and damage the prop. On twin-drive boats, mount the transducer between the drives, if possible. Fishfinder 340C Owner’s Manual nstAllIng the IshfInder ountIng the NOTE: DO NOT mount the transducer behind strakes, struts, fittings, water intake or discharge ports, or anything that creates air bubbles or causes the water to become turbulent.
  • Page 18 5 and 6 using the other cable clamp. 7. Route the transducer cable, as needed, to the Fishfinder. DO NOT CUT THE CABLE. Avoid routing the cable with electrical wires or other sources of electrical interference. Align with the transom bottom. The transducer should extend /" below fiberglass hulls or 3/" below aluminum hulls. Drill pilot holes here. Level Keep it parallel with the water line. Fishfinder 340C Owner’s Manual...
  • Page 19 • In an area of clean (non-turbulent) water at all speeds. • The location must not be over any strakes or behind any obstruction on the hull that would create turbulence at speed. Fishfinder 340C Owner’s Manual nstAllIng the IshfInder NOTE: Many modern hulls have a dedicated pocket for shoot-thru-hull transducer installation.
  • Page 20 IshfInder ountIng the To permanently install the transducer: 1. Lightly sand the surface of the hull and face of the transducer with 400 grit wet or dry sandpaper. 2. Build a dam using strip caulk about 1/4" (6 mm) tall. Pour about 1/8" (3 mm) of two-part, slow-cure epoxy into the dam. 3. Place the transducer in the epoxy, turning the transducer to work out any air bubbles. 4. Weight the transducer in place, and allow it to cure for 24 hours. rAnsducer Fishfinder 340C Owner’s Manual...

  • Page 21: Installing The Wiring Harness

    Black wires. The other wires do not have to be connected for normal operation of the Fishfinder unit. For information on connecting to a NMEA or CANet compatable device, see pages 17-19. Fishfinder 340C Owner’s Manual nstAllIng the To install the wiring harness: 1. Use a test light or voltmeter to determine the polarity of the voltage source.
  • Page 22 IshfInder nstAllIng the The Fishfinder 340C can be connected to another piece of NMEA compatible electronic equipment, such as a Garmin GPS (Global Positioning System) device. If equipped with a capable transducer, the Fishfinder 340C can send depth, temperature, and speed information.
  • Page 23 340c > nstAllIng the IshfInder nstAllIng the IrIng Arness (CANet L) Orange (Accessory On) (CANet H) (RX NMEA) (TX NMEA) Fishfinder 340C Pin Assignment DC Power Accessory On Source CANet L CANet H Fishfinder 340C Wiring Harness Fishfinder 340C Owner’s Manual...
  • Page 24 CANet - if applicable - optimizes the performance of CANet- compatible units, allowing sonar information from the Fishfinder 340C to be shared with up to two CANet compatible Garmin GPS units. A standard NMEA connection only allows depth, temperature, and speed information to be sent to a single GPS...
  • Page 25 Connection Diagram Below GREEN CANet WHITE Extension Cable BLACK DRAIN BATTERY 10-35 VOLTS DC CANet Unit To CANet Compatable Garmin GPS Unit CANet Terminator Fishfinder 340C CANet Wiring Diagram IshfInder nstAllIng the IrIng CANet Terminator GREEN Fishfinder WHITE 340C ORANGE BLACK BLACK FUSE CANet Terminator Connection...

  • Page 26: Testing The Installation

    DO NOT leave your boat in the water for an extended period of time without checking for leaks. To test the transom mount installation: 1. Begin testing the installation at a slow speed. If the sonar appears to be working properly gradually increase the boat’s speed observing the sonar’s operation. If the sonar signal suddenly is lost or the bottom return is severely degraded, note the speed at which this occurs. 2. Return the boat to the speed at which the signal was lost. Make moderate turns in both directions, and see if the signal improves. 3. If the signal strength improves while turning, adjust the transducer so that it extends another 1/8" below the transom of the boat. It might take several adjustments to eliminate the degradation. 4. If the signal does not improve, it might be necessary to move the transducer to a different location. Fishfinder 340C Owner’s Manual...

  • Page 27: Using The Fishfinder 340C

    IshfInder If you are turning on your Fishfinder 340C for the first time, use the following procedure. If you have already turned on your Fishfinder, and you are just familiarizing yourself with the basic functions, please go to “Learning the Basic Functions” on this page.

  • Page 28: Using The Fishfinder 340C Keypad

    IshfInder sIng the IshfInder Using the Fishfinder 340C Keypad Power/backlight Key • Press and hold to turn the unit on or off. • Press and release to cycle through the maximum, user-set, and minimum backlight brightness levels. pAGE Key •...

  • Page 29: Understanding The Main Pages

    Understanding the Main Pages The Fishfinder 340C typically offers several main pages for you to use, including the Sonar Page, Flasher Page, and Numbers Page. If you are using a dual frequency transducer, and you have the Frequency set to dual, the following pages are available instead: Split Sonar (200 kHz and 50 kHz), Sonar (200 kHz), Sonar (50 kHz), and Numbers.
  • Page 30 For more information on understanding the sonar, read the Getting Started section of this manual (see Using Split When Zoomed You can set your Fishfinder to split the screen every time use the Zoom option on a full-screen Sonar Page. page Fishfinder 340C Owner’s Manual...
  • Page 31 If Zoom contains a setting other than Off, the current Zoom setting is used for half of the screen, and the other side is not zoomed. Fishfinder 340C Owner’s Manual sIng the IshfInder nderstAndIng the Using the Flasher Page If you prefer the appearance of flasher sonars, use the Flasher Page. It provides an almost instantaneous return of what is below your boat.

  • Page 32: Using The Main Menu

    To view or change a setting in the Main Menu: 1. Press and hold ADJ/MENU. The Main Menu appears. 2. Highlight the tab for the option you want to view or change. 3. Highlight the setting you want to change, and press ENTER. The available settings appear. 4. Highlight the setting you want, and then press ENTER. The new setting is now active. Your changes to the Main Menu settings are used until you go to the Main Menu and set the System Factory Settings option to yes. Fishfinder 340C Owner’s Manual...

  • Page 33: Graph Tab

    No background information appears. suspended targets appear as symbols with no background information shown. The target depth is indicated. Fishfinder 340C Owner’s Manual sIng the IshfInder suspended targets appear as symbols. Background information appears, making the distinction between fish and structure easier.

  • Page 34: Sonar Tab

    One half of that speed produces a 50% scroll rate, and so on. The default is 30.0 kt. • Transducer Type—allows you to specify what type of transducer you are using. page 36) with the speed of your vessel Fishfinder 340C Owner’s Manual...
  • Page 35 If the new speed is correct, highlight OK, and press ENTER. If you want to manually enter a calibration, press ENTER on the speed field, enter a new speed, and press ENTER. Fishfinder 340C Owner’s Manual sIng the IshfInder sIng the NOTE: If the boat is not moving fast enough or the speed sensor is not registering a speed, a “Boat Is Not Moving Fast Enough To Calibrate”...

  • Page 36: Alarms Tab

    Alarms Tab The Alarms tab contains settings for the Fishfinder’s alarms. (For a list of alarms and unit messages, see divided into two sub tabs: Sonar alarms and System alarms. page 43.) The Alarm tab is Fishfinder 340C Owner’s Manual...
  • Page 37 25 feet or shallower than 15 feet. • Water Temp—sets an alarm to sound when the transducer reports a temperature either above, below, inside, or outside the specified values. Fishfinder 340C Owner’s Manual sIng the IshfInder System Sub Tab •...

  • Page 38: System Tab

    Sonar NMEA data. See available NMEA sentences. • Factory Settings—restores all settings to the original factory default values. The Fishfinder 340C turns off and back on again when you select yes. • Software Version—shows the Fishfinder’s software version, copyright date, and unit ID.

  • Page 39: Units Tab

    Nautical (nm/m, kt), Statute (mi, mh), or metric (km, kh). • Position Format—changes the coordinate system in which a position reading appears. The default format is latitude and longitude in degrees, minutes, and thousandths of a minute Fishfinder 340C Owner’s Manual sIng the IshfInder (hddd°mm.mmm’). The following additional formats are available: latitude/longitude in decimal degrees (hddd.

  • Page 40: Using The Adjustment Menu

    This menu varies depending on your transducer type, your current page, and your current settings. You can make all adjustments by using the ROCKER and the ENTER key. Fishfinder 340C Owner’s Manual...
  • Page 41 • Range—sets the screen depth range used for viewing. Auto (recommended) automatically tracks the bottom, or you can set a specific depth range (making sure the range includes the bottom of the water). Fishfinder 340C Owner’s Manual sIng the IshfInder sIng the •...
  • Page 42 Off. You can use the Zoom View setting to change the viewing range of a zoomed display. Auto follows the water bottom. If you select bottom lock, use the Span setting to adjust how far off the bottom the Fishfinder shows data. page 28.) Fishfinder 340C Owner’s Manual...

  • Page 43: Configuring Advanced Data Fields

    • Swap Split—available on the Split Sonar Page when Frequency is set to dual. This switches on which side the frequencies appear. Fishfinder 340C Owner’s Manual sIng the IshfInder onfIgurIng Configuring Advanced Data Fields The top-left corner of the screen contains configurable data fields for the Sonar Pages.
  • Page 44 (BRG). This field requires NMEA input. SOG (speed over ground)—the actual speed that the GPS unit is moving over the ground. This field requires NMEA input. STW (speed through water)—the speed as calculated by an optional speed sensor on the transducer. Fishfinder 340C Owner’s Manual...

  • Page 45: Pausing A Sonar Or Flasher Page

    XTE (crosstrack error)—how far off the chosen course you are, measured by your selected distance units. This indicates if you are to the left or right of the course. Fishfinder 340C Owner’s Manual sIng the IshfInder AusIng A Pausing a Sonar or Flasher Page Use a paused screen to take a better look at sonar returns.

  • Page 46: Marking A Waypoint

    You can use Pointer mode to move a cursor around on the paused Sonar Page to reference sonar items and mark waypoints for that location (if your Fishfinder is attached to a Garmin GPS or compatible NMEA navigation device; see use Pointer mode, a data field appears at the top of the graph with the cursor’s depth, surface temperature for that location, and GPS...
  • Page 47 To mark an underwater waypoint: 1. Make sure that your Garmin GPS or compatible NMEA navigation device is properly attached and the NMEA Input/Output is On (see page 32). 2. From a Sonar Page, press and hold PAUSE to enter Pointer mode and pause the screen movement. 3. Use the ROCKER to move the cursor onto the target (for example, an underwater drop off or stump) that you want to mark. Data appears with the GPS coordinates, depth, and surface temperature for that location. 4. Press ENTER. The New Waypoint Window appears with a default four-digit name and the pointer’s coordinates automatically filled in. Fishfinder 340C Owner’s Manual sIng the IshfInder 5. To change the name, highlight the name field, and press ENTER. 6. Make your changes using the ROCKER. (Alphabetic and numeric characters are available.) Press ENTER when you are finished. 7. Use the ROCKER to move the field highlight to OK, and press ENTER. The Fishfinder then sends a NMEA WPL sentence to an attached GPS unit or NMEA navigational device. ArkIng A...

  • Page 48: Appendix

    To exit Simulator mode, turn off the Fishfinder. Optional Accessories Purchase the following optional accessories on the Garmin Web site: Quick-release flush mount kit—mounts your Fishfinder flush on the bulkhead or cabin wall. Press the side clips to release the Fishfinder so you can take it with you.

  • Page 49: Messages And Alarms

    Messages and Alarms The Fishfinder 340C uses an on-screen pop-up message system to alert you to unit operating characteristics. When a message appears, press ENTER to acknowledge the message and return to the page you were viewing. Anchor drag Alarm—you have drifted out of the specified distance range.

  • Page 50: Limited Warranty

    Within this period, Garmin will at its sole option repair or replace any components that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor, provided that the customer shall be responsible for any transportation cost.

  • Page 51: Software License Agreement

    Hereby, Garmin declares that this Fishfinder 340c product is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC. To view the full Declaration of Conformity, see the Garmin Web site for your Garmin product: http://www.garmin.com/products/ff340c/. Click Manuals and then select the Declaration of Conformity Fishfinder 340C Owner’s Manual...

  • Page 52: Index

    25 the wiring harness 15 flush mounting the fishfinder 7 installing the fishfinder 5 frequency 36 interfacing 16 200 kHz 2 50 kHz 2 keel offset 28 fuse 15, 42 keypad, using the 21, 22 Fishfinder 340C Owner’s Manual...
  • Page 53 22 NMEA 16, 29, 32, 33, 41 reset odometer 32 NMEA address 16 ROCKER key 22 Fishfinder 340C Owner’s Manual strongest sonar returns 4 stw (speed through water) 38 scale 27 surface clutter 4 scale, log and graph 30...
  • Page 54 (velocity made good) 39 volt 39 voltage 15, 20, 21 warranty 44 water immersion iii water speed 27, 29, 37 water temperature 37 water temperature alarm 31 waypoint 41 waypoint, marking a 40 weakest returns 4 Fishfinder 340C Owner’s Manual...
  • Page 56 Visit the Garmin Web site at www.garmin.com. © 2005, 2007 Garmin Ltd. or its subsidiaries Garmin International, Inc. 1200 East 151 Street, Olathe, Kansas 66062, USA Garmin (Europe) Ltd. Liberty House, Hounsdown Business Park, Southampton, Hampshire, SO40 9RB UK Garmin Corporation No.

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