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Eagle FISHMARK 320 Installation And Operation Instructions Manual

Fish-finding & depth sounding sonars.
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Pub. 988-0143-661
FishMark 320 and
SeaFinder 320DF
Fish-finding & Depth Sounding Sonars
Installation and Operation


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   Summary of Contents for Eagle FISHMARK 320

  • Page 1

    Pub. 988-0143-661  FishMark 320 and  SeaFinder 320DF Fish-finding & Depth Sounding Sonars Installation and Operation Instructions...

  • Page 2

    Eagle Electronics Marine-Tex is a trademark of Illinois Tool Works Inc. Eagle Electronics may find it necessary to change or end our policies, regulations, and special offers at any time. We reserve the right to do so without notice.

  • Page 3: Table Of Contents

    Basic Sonar Quick Reference ... 39 Sonar Operations ... 40 Fish Symbols vs. Full Sonar Chart ... 43 Other Free Training Aids ... 43 Section 4: Sonar Options & Other Features ... 45 ASP (Advanced Signal Processing) ... 45 Alarms ... 46 Calibrate Speed... 49 Chart Speed...

  • Page 4

    Sonar Color Mode... 70 Sonar Chart Display Options ... 70 Full Sonar Chart ... 70 Split Zoom Sonar Chart ... 71 Split Frequency Sonar Chart (Seafinder 320df only)... 72 Digital Data/Chart ... 73 Sonar Simulator... 74 Stop Chart ... 74 Surface Clarity ...

  • Page 5: Section 1: Read Me First

    First, we want to thank you for buying an Eagle sonar. Whether you're a first time user or a professional fisherman, you'll discover that your unit is easy to use, yet capable of handling demanding sonar tasks.

  • Page 6: Capabilities And Specifications

    Section 4, which discusses more advanced Sonar Options and Other Features. When you come to a sonar menu command on the unit's screen, you can look it up in the manual by skimming over the table of contents, just flip- ping through Section 3 or scanning through the sonar options in Section 4.

  • Page 7

    SeaFinder 320DF. It has 35°/12° cone angles. A single-frequency Skimmer trans- ducer with built-in temperature sensor is packed with the FishMark 320. It has a 20° cone angle. Transducers operate at speeds up to 70 mph (61 kts) FishMark 320: 800 feet (244 meters).

  • Page 8: How To Use This Manual: Typographical Conventions

    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.

  • Page 9

    Instructions = Menu Sequences Most functions you perform with the sonar unit are described as a se- quence of key strokes and selecting menu commands. We've written them in a condensed manner for quick and easy reading.

  • Page 10

    Sonar Features menu command. Then press the Enter key." Step 2 would mean: "Press the right arrow key (for dual-frequency units) or press the right arrow key followed by the down arrow key (for single-frequency units) to select (highlight) the Fish ID symbols com-...

  • Page 11: Section 2: Installation & Accessories

    Installation & Accessories Preparations You can install the sonar system in some other order if you prefer, but we recommend this installation sequence: Caution: You should read over this entire installation section before drill- ing any holes in your vessel! 1.

  • Page 12: Recommended Tools And Supplies

    Remember, the transducer installation is the most critical part of a sonar installation. Recommended Tools and supplies If you prefer the option of routing the cable through the transom, you will need a 5/8"...

  • Page 13

    If the transducer is not placed in a smooth flow of water, interference caused by bubbles and turbulence will show on the sonar's display in the form of random lines or dots whenever the boat is moving.

  • Page 14

    How low should you go? For most situations, you should install your Skimmer transducer so that its centerline is level with the bottom of the boat hull. This will usually give you the best combination of smooth water flow and protec- tion from bangs and bumps.

  • Page 15: Transom Transducer Assembly And Mounting

    However, the shoot-thru-hull installation does have its drawbacks. First, some loss of sensitivity does occur, even on the best hulls. This varies from hull to hull, even from different installations on the same hull. This is caused by differences in hull lay-up and construction. Second, the transducer angle cannot be adjusted for the best fish arches.

  • Page 16

    B. Two-piece bracket: Locate the four plastic ratchets in the trans- ducer's hardware package. Press two ratchets into the sides of the plas- tic bracket and two on either side of the transducer as shown in the fol- lowing illustrations. Notice there are letters molded into each ratchet. Place the ratchets into the bracket with the letter "A"...

  • Page 17

    2. Aligning the transducer on the transom. A. One-piece bracket: Slide the transducer between the two ratch- ets. Temporarily slide the bolt though the transducer assembly and hold it against the transom. Looking at the transducer from the side, check to see if it will adjust so that its face is parallel to the ground. If it does, then the "A"...

  • Page 18

    bracket holes with the letter "B" aligned with the bracket alignment mark. Place them on the transducer aligned with the 12 o'clock posi- tion on the transducer stem. Reassemble the transducer and bracket and place them against the transom. Again, check to see if you can move the transducer so it's parallel with the ground.

  • Page 19

    B. Two-piece bracket: Once you determine the correct position for the ratchets, assemble the transducer as shown in the figure in step 2B. Don't tighten the lock nut at this time. 4. Drilling mounting holes. Hold the transducer and bracket assembly against the transom. The transducer should be roughly parallel to the ground.

  • Page 20

    Electrical noise from the engine's wiring, bilge pumps, VHF radio wires and cables, and aerators can be picked up by the sonar. Use cau- tion when routing the transducer cable around these wires.

  • Page 21: Trolling Motor Bracket Installation (single-frequency Only)17

    (not included) to attach the transducer cable to the troll- ing motor shaft. Make sure there is enough slack in the cable for the motor to turn freely. Route the cable to the sonar unit and the trans- ducer is ready for use.

  • Page 22

    Transducer mounted on trolling motor, side view. TRANSDUCER ORIENTATION AND FISH ARCHES If you do not get good fish arches on your display, it could be because the transducer is not parallel with the ground when the boat is at rest in the water or at slow trolling speeds.

  • Page 23: Shoot-thru-hull Preparation And Installation

    The transducer installation inside a fiberglass hull must be in an area that does not have air bubbles in the resin or separated fiberglass lay- ers. The sonar signal must pass through solid fiberglass. A successful transducer installation can be made on hulls with flotation materials (such as plywood, balsa wood or foam) between layers of fiberglass if the material is removed from the chosen area.

  • Page 24

    Next, take the transducer out of the water and place it in the water in the sump of the boat. Observe the sonar signal to see if there is a no- ticeable decrease in sensitivity. The second bottom signal may disap- pear and the bottom signal may decrease in intensity.

  • Page 25: Speed/temperature Sensors

    This unit is packed with a transducer containing a built-in temp sen- sor. The SeaFinder package also includes a speed sensor. If you have a FishMark 320 and want a speed sensor or additional temp sensor, see the Accessory Ordering Information in the back of this manual.

  • Page 26

    Power/trans- ducer cable Sonar unit with secondary external temperature sensor. Power/trans- ducer cable. Sonar unit with external speed sensor or combo speed/temp sensor. The primary temperature sensor is built into the transducer. Sonar unit rear view Temp sensor built into transducer.

  • Page 27

    Optional Speed Sensor Installation All the units in this series can display speed and distance traveled, but only the SeaFinder 320DF comes packed with a speed sensor. If you wish to purchase an optional additional sensor for your unit, refer to the accessory ordering information inside the back cover of this man- ual.

  • Page 28: Power Connections

    Speed sensor mounting configuration: side view (left) and rear view (right.) Route the sensor's cable through or over the transom to the sonar unit. If you need to drill a hole in the transom to pass the connector through, the required hole size is 5/8".

  • Page 29

    This will protect both the unit and the power cable in the event of a short. It uses a 3-amp fuse. Power connections for the sonar unit. Optional power off switch for saltwater installations...

  • Page 30: Mounting The Unit: Bracket, In-dash Or Portable

    Mounting the Unit: Bracket, In-Dash or Portable You can install the sonar unit on the top of a dash with the supplied gimbal bracket. It can also be installed in the dash or mounted on a portable power supply.

  • Page 31

    (A drawing on the next page shows the dimensions of a gimbal-mounted sonar unit.) Holes in the bracket's base allow wood screw or through-bolt mounting.

  • Page 32: In-dash Installation

    [5.43] Front view (left) and side view (right) showing dimensions of the sonar unit when mounted on gimbal bracket. Before positioning the bracket, be sure to hold the cables against the rear edge of the hole. Then, slide the bracket over the hole and butt the rear of the bracket base firmly against the cables, thus pinning them in place against the side of the hole.

  • Page 33: Portable Installation

    Portable Installation Like many Eagle products, this sonar unit is capable of portable opera- tion by using the optional PPP-13 portable power pack. The power pack and an optional portable transducer expand the uses for your sonar unit.

  • Page 34: Face Cover

    "D" cell battery Install batteries in power pack battery adapter. Face Cover Your unit comes with a white protective cover that snaps on and off the front of the unit. This cover is intended for use when your unit and the vehicle it's mounted in are idle.

  • Page 35: Section 3: Basic Sonar Operation

    Before you turn on the unit, it's a good idea to learn about the different keys, the Main Menu, the Sonar Menu, the four Page options and how they all work together. BUT, if you just can't wait to get on the water, turn to the one-page Quick Reference on page 39.

  • Page 36: Power/lights On And Off

    6. EXIT – The Exit key lets you return to the previous screen, clear data or erase a menu. 7. ALARM – The Alarm key is a quick shortcut to the sonar alarms menu. It allows you to choose which alarms to use and when.

  • Page 37: Menus

    Menus Your sonar unit will work fine right out of the box with the factory de- fault settings. You only need to learn a few basic functions to enhance your viewing. We'll discuss them briefly here, then talk about them and all the other commands in more detail in the next section, which begins on page 45.

  • Page 38

    • Sonar Alarms command: turns alarms on or off and changes alarm thresholds. The fish alarm, used with Fish I.D., is the most popular use. It tells you when the sonar sees a fish. You can also set deep or shallow depth alarms and zone alarms.

  • Page 39: Sonar Menu

    . To clear the menu screen and return to the Page display, press EXIT Sonar Page Menu. Most of these functions are discussed in Sec. 4. Sonar Menu Commands The Sonar Menu contains commands for the major sonar features and...

  • Page 40

    Fish I.D. symbols, the zoom bar and zone bar. • Ping Speed command: sets the rate at which sonar pings are made. Pages The Pages Menu controls the four major display options. They are the Full Sonar Chart, Split Zoom Sonar Chart, Split Frequency Sonar Chart and Digital Data.

  • Page 41

    Pages Menu showing some Sonar display options (at left, dual-frequency menu; at right, single-frequency menu). The Full Sonar Chart is the main display option. This is a "cross- section" view of the water column beneath the boat. The chart moves across the screen, displaying sonar signal echoes that represent fish, structure and the bottom.

  • Page 42

    We'll discuss all of those features and options in Section 4, but to show you how easy the sonar unit is to operate, see the following 10-step quick reference that will cover most fish finding situa- tions.

  • Page 43: Basic Sonar Quick Reference

    The auto settings will track the bottom, displaying it in the lower por- tion of the screen. The full sonar chart will scroll from right to left, showing you what's under the boat as you cruise across the water.

  • Page 44: Sonar Operations

    As you can see from the quick reference, basic operation is pretty easy, right out of the box. If you are a sonar novice, try operating the unit with the fac- tory defaults until you get a feel for how it's working.

  • Page 45

    Adjusting sensitivity in Manual Sensitivity Mode is similar to driving a car without cruise control — you have complete manual control of the car's speed. In the sonar unit, manual mode allows you to set sensitiv- ity at 100 percent (maximum) or zero percent (minimum.) Depending...

  • Page 46

    ↑ to increase sensitivity. When it's set at the desired level, press . (When you reach the maximum or minimum limit, a tone sounds.) EXIT At left, Sonar Menu with Sensitivity command selected. At right, the NOTE: If you want to change the sensitivity in Manual Mode, first turn off Auto Sensitivity: from the Sonar Page, press |↑...

  • Page 47: Fish Symbols Vs. Full Sonar Chart

    Fish I.D. fish symbol feature. Here's why. Fish I.D. is an easier way for a sonar novice to recognize a fishy signal return when he sees it. However, locating fish by symbol only has some limitations.

  • Page 48

    Aside from being just plain fun, this program can help you learn both basic and advanced operations without burning boat fuel! Eagle is one of the first sonar manufacturers to provide this type of training tool for customers.

  • Page 49: Section 4: Sonar Options & Other Features

    Material in this section is arranged in alphabetical order. ASP (Advanced Signal Processing) The ASP feature is a noise rejection system built into the sonar unit that constantly evaluates the effects of boat speed, water conditions and interference. This automatic feature gives you the best display pos- sible under most conditions.

  • Page 50: Alarms

    |↓ to MENU OISE EJECTION This unit has three different types of sonar alarms. The first is the Fish Alarm. It sounds when the Fish I.D. feature determines that an echo is a fish. Another alarm is the Zone Alarm, which consists of a bar on the side of the screen.

  • Page 51

    4. Press ← to HALLOW 5. To turn off the alarm, press To switch to a different depth setting, open the Sonar Alarms menu and repeat the instructions in step 3 above. To adjust and turn on the deep alarm: 1.

  • Page 52

    LARM EXIT ABLED To switch to a different depth setting, open the Sonar Alarms menu and repeat the instructions in steps 3 and 4 above. Fish Alarm Use the fish alarm for a distinctive audible alarm when fish or other suspended objects are detected by the Fish I.D....

  • Page 53: Calibrate Speed

    50 percent. If you are drifting slowly, try a chart speed around 75 percent. When you are stationary and a fish swims through the sonar signal cone, the image appears on the screen as a long line instead of a fish arch. Reducing the chart speed may result in a shorter line that more closely resembles a regular fish return.

  • Page 54: Depth Cursor

    Cursor line Depth box Sonar chart with the depth cursor active. The line indicates the large fish is 34.64 feet deep. The cursor can be moved to any location on the screen, letting you pin- point the depth of a target.

  • Page 55: Depth Range - Automatic

    There are 16 depth ranges, from 5 feet to 4,000 feet. To switch to Manual Depth Range: 1. First, turn off automatic depth range. From the Sonar Page, press 2. Press ↑ to Control Scale appears.

  • Page 56: Fastrack

    To turn Auto Depth Range on again: 1. From the Sonar Page, press NOTE: The sonar's depth capability depends on the transducer installa- tion, water and bottom conditions, and other factors. FasTrack This feature automatically converts all echoes to short horizontal lines on the display's far right side.

  • Page 57

    Does that mean Fish I.D. is broken? No — the feature is simply inter- preting sonar returns in a specific way to help take some of the work out of reading the screen. Remember: Fish I.D. is one of the many tools we provide so you can analyze your sonar returns for maximum fish finding information.

  • Page 58

    FasTrack graph confirms fish At left, figures 1A and 2A show Sonar Page in normal chart mode. At right, figures 1B and 2B show the same underwater scene with Fish I.D. turned on. Note how arches are replaced with symbols.

  • Page 59: Fishtrack

    Sonar Features menu with Fish I.D. Depths selected (at left, dual- frequency menu; center, single-frequency menu). When the check box to the left is checked, the feature is on. At right, Sonar Page showing Fish I.D. symbols and FishTrack depths turned on.

  • Page 60

    Also note that when using FishReveal, we recommend that you turn off Auto Sensitivity and turn up Sensitivity to near maximum. Sonar Color Mode command with FishReveal selected (at left, dual-frequency menu; at right, single-frequency menu). To turn FishReveal on: 1.

  • Page 61

    The 200 kHz transducer will give you better detail and definition, but less depth penetration. The 50 kHz transducer will give you greater depth penetration, but a little less detail and less definition. (Remember, all sonar units typically read deeper in fresh water than in salt water.) Visible fish...

  • Page 62: Grayline

    There is a common exception to these rules of thumb. Some fishermen on freshwater lakes (or the ocean) using downriggers like to see them on the sonar. In many of those cases, you'll see a 50 kHz transducer frequency in use because the wider cone angle lets them watch the bait.

  • Page 63

    Grayline is adjustable. Experiment with your unit to find the Grayline setting that's best for you. To adjust the Grayline level: 1. From the Sonar Page, press 2. The Grayline Control Bar appears. Press ↓ to decrease Grayline; press ↑ to increase Grayline.

  • Page 64: Hyperscroll

    See the entry on Ping Speed, which controls the HyperScroll feature. Noise Rejection See the entry on Advanced Signal Processing in this section. Overlay Data To change the digital data shown on top of the sonar page: 1. Press |↓ to MENU VERLAY 2.

  • Page 65

    At left, we scrolled down the data list to highlight "Water Speed." At right, data list showing "Water Speed" selected to display on Sonar Page. 3. To return to the previous page, press To turn off displayed data: 1. Press |↓...

  • Page 66: Ping Speed & Hyperscroll

    Some data types can be displayed in only one font size. If that is the case, the Data Size box will not be displayed for that data type. Sonar chart with Overlay Data turned on. This example shows Depth, Water Temperature and the Water Speed of the boat.

  • Page 67

    FasTrack bar graph display doubles in width at the right side of the screen. The allows you to better see the virtually instantaneous sonar returns, just as you would on a flasher sonar unit. For more informa- tion on FasTrack, see it's entry in this section.

  • Page 68: Pop-up Help

    Pop-up Help Help is available for virtually all of the menu labels on this unit. By highlighting a menu item and leaving it highlighted for a few seconds, a "pop-up" message appears that describes the function of the menu item. This feature is on by default.

  • Page 69: Reset Water Distance

    Reset Water Distance The sonar chart's Digital Data display option includes a window that shows distance traveled, called Water Distance ("W Distance"). This information is calculated from an optional water speed sensor. The Wa- ter Distance window can be reset to zero using the Reset Water Dis- tance command.

  • Page 70

    best sensitivity level shows a good solid bottom signal with Grayline and some surface clutter. Automatic Sensitivity The default sensitivity mode is automatic. The unit bases the sensitiv- ity level on water depth and conditions. When the unit is in the auto- matic mode, sensitivity is automatically adjusted to keep a solid bottom signal displayed, plus a little more power.

  • Page 71: Set Keel Offset

    To adjust sensitivity in manual mode: 1. First, turn off Auto Sensitivity: from the Sonar Page, press ENSITIVITY 2. Press ↑ to ENSITIVITY Press ↓ or ↑ to pick a different sensitivity setting. When it's set at the desired level, press To turn Auto Sensitivity back on: 1.

  • Page 72

    eliminates the need for the navigator to mentally calculate how much water is under his keel. Keel Offset lets you calibrate the digital depth: chart depth scale, chart cursor depth and fish symbol depth displayed on the screen. To calibrate the depth indicators, first measure the distance from the face of the transducer to the lowest part of the boat.

  • Page 73: Set Language

    Software Version Information From time to time, Eagle updates the operating system software in some of its products. These software upgrades are usually offered to customers as free downloads from our web site,

  • Page 74: Sonar Color Mode

    Sonar Color Mode The default color scheme for the sonar chart is grayscale, but we offer other variations to suit your viewing preferences. You can select the chart to be displayed in reverse grayscale, bottom black or FishReveal mode. (For more information on FishReveal, see the entry on that topic elsewhere in this section.)

  • Page 75: Split Zoom Sonar Chart

    The zoom range shows at the bottom left corner of the screen. Split Zoom Sonar Chart. Image at left shows the left window zoomed to 2X. The right image shows the left window zoomed to 4X.

  • Page 76: Split Frequency Sonar Chart (seafinder 320df Only)

    Split Frequency Sonar Chart (SeaFinder 320DF only) This page shows sonar data from the 50 kHz transducer element on the left side of the screen and data from the 200 kHz transducer on the right side. All other functions and features are the same as the Full Chart page.

  • Page 77: Digital Data/chart

    Customizing the Digital Data/Chart Screen The Digital Data/Chart screen can be customized to show digital data different from the defaults first shown. To customize this screen: 1. From the Sonar Page (in Digital Data mode), press |↓ to MENU USTOMIZE 2.

  • Page 78: Sonar Simulator

    Stop Chart If you are running multiple units on a boat, there are times when you may want to turn off the sonar. This command turns off the sonar and stops the chart from scrolling. Sonar restarts automatically each time you turn on your unit.

  • Page 79: Surface Clarity

    It can also be turned off. The default level is off. To adjust the Surface Clarity level: 1. From the Sonar Page, press Sonar Features menu with Surface Clarity selected (at left, dual- frequency menu; at right, single-frequency menu). 2. Press → to...

  • Page 80: Units Of Measure

    Surface clutter In the illustration at left, Surface Clarity is turned off. The right view shows Surface Clarity set at High. Units of Measure To set Speed/Distance Unit of Measure: Speed/Distance, then to return to the page display. EXIT|EXIT|EXIT Zoom & Zoom Bar "Zooming"...

  • Page 81: Zoom Pan

    Press the Zoom Out key, , to return the display to the normal mode. ZOUT At left, Sonar Page, normal view. Center, same view zoomed to 2X. Right, same view zoomed to 4X Zoom Pan Your unit has the handy ability to quickly zoom in on any portion of the water column with just the touch of an arrow key.

  • Page 82


  • Page 83: Section 5: Troubleshooting

    Unit freezes, locks up, or operates erratically: 1. Electrical noise from the boat's motor, trolling motor, or an accessory may be interfering with the sonar unit. Rerouting the power and trans- ducer cables away from other electrical wiring on the boat may help.

  • Page 84

    This can cause the unit to eliminate weaker signals such as fish or even structure from the display. 3. The water may be deeper than the sonar's ability to find the bottom. If the sonar can't find the bottom signal while it's in the automatic mode, the digital sonar display will flash continuously.

  • Page 85

    Now turn on each piece of electrical equipment on the boat and view the effect on the sonar's display. For example, turn on the bilge pump and view the sonar display for noise. If no noise is...

  • Page 86

    VHF radio antenna cables radiate noise when transmitting, so be certain to keep the sonar's wires away from it. You may need to route the sonar unit's power cable directly to the battery to isolate it from other wiring on the boat.

  • Page 87


  • Page 88


  • Page 89: Section 6: Supplemental Material

    EAGLE ELECTRONICS FULL ONE-YEAR WARRANTY "We," "our," or "us" refers to EAGLE ELECTRONICS, a division of LEI, the manufacturer of this product. "You" or "your" refers to the first person who purchases this product as a consumer item for personal, family, or household use.

  • Page 90: How To Obtain Service

    8 a.m. to 5 p.m. Central Standard Time, M-F Eagle Electronics may find it necessary to change or end our shipping policies, regulations, and special offers at any time. We reserve the right to do so without notice.

  • Page 91

    1. Always use the original shipping container and filler material the product was packed in. 2. Always insure the parcel against damage or loss during shipment. Eagle does not assume responsibility for goods lost or damaged in transit. 3. For proper testing, include a brief note with the product describing the problem.

  • Page 92

    Eagle Pub. 988-0143-661 Printed in USA 101702 Visit our web site:  © Copyright 2002 All Rights Reserved Eagle Electronics...

Comments to this Manuals

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Latest comments:
  • Wayne Ligler Jun 22, 2015 02:22:
    I need an owners manual for 2 units - one is a fishmark 320 and the other is a Cuda 168 unit. Can you please send me the written manuals? Wayne Lligler,90​57 Shady Lane, Trego, WI 54888. E-mail is ligler-hun​
  • Lance Rouse Jul 10, 2014 01:19:
    When I have the trolling motor on, my 320 the sonar unit depth cursor stops working and just blinks until I turn the trolling motor off at which time it stops blinking and shows the proper depth. Any ideas??
  • garry miller Jul 15, 2013 11:18:
    I have an eagle FishMark 320. I have tried to shut it off but within a few minutes it comes back on. It kills the battery on the boat. Other than disconnect​ing it, any ideas ??
  • David Nalley Apr 09, 2013 11:59:
    I have a Eagle Fishmark 320 and I need a owners manual. I saw where I can send off for a free manual. can one be sent to me at. David Nalley 2113 Woodlawn Road, Bardstown Ky. 40004. My e-mail nalleys211​​m thank you