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I have a Eagle Fishmark 480. Last year it worked fine. Now it takes a long time to find bottom depth when I first turn it on. When it does it will stick at 2.8 feet. It has the most problem with 5 to 10 foot depth when in auto range. It will read for a while and then go back to 2.8 and the depth bar will read 0-5 feet. If I switch to manual depth range of 0-10 I can see the bottom structure but the depth reading will remain at 2.8. I'm guessing it's the transducer since it sat out in 30 to 40 below weather last winter. Has anyone else had these problems? I have same problem. Changed transducers twice but problem starts again.

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  • Dean
    Dean May 11, 2010

    What is the condition of the plug pins on the back of the display unit? Are they clean and free of corrosion or other buildup?

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Posted on Jan 02, 2017

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SOURCE: lowrance x135 not functioning properly

Had the same issue with another brand. Turned out the transducer cable was picking up noise from other cables (power, trolling mtr. etc). Try moving the transducer cable away from any other cables. I put the cable in a 1/4 " plastic housing up to the point where it was above deck and it stopped all the strange stuff. Not sure about the temp issue??

Posted on Jul 21, 2009

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SOURCE: Eagle 640c Fish Finder dosen't read corectly.

I had the same problem and got the transducer changed. It now works perfectly. That could be the problem you are having... bad transducer.

Posted on Jul 22, 2009

  • 1 Answer

SOURCE: Hi, I have a Matrix 12 Sounder and the depth

Ihave the same problem

Posted on Aug 05, 2009

  • 1 Answer

SOURCE: Eagle Cuda 128 does not read water depth

Hi Chris, Did you get a fix for this issue? My Dad's Eagle Cuda 128 is also having the same problem - constant reading of 60ft. I'd love to hear if you have a solution. Many thanks,

Posted on Oct 27, 2009

  • 1 Answer

SOURCE: my 570 transducer is mounted on trolling motor.

I too have the exact same problem. .6 to 6ft then stays at .6. love to figure this out.

Posted on May 08, 2010

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2 Answers

Won't work over certain speeds


Think of where the transducer is fitted on your boat . As turbulence is the only problem you need to worry about. It needs too be on the transom but in between the lower 2 chines

Apr 17, 2012 | Eagle Fishmark 320 Portable Fishfinder

2 Answers

Just purchased and Eagle Fishmark 320 used. Will not display depth reading - just shows 0'0"? I have reset to factory settings. We have had in lake,same thing. Right now in 5 gallon bucket of...


Hello! Do you have the PDF users guide for your unit? I'm looking at a copy in the troubleshooting section...I don't want to cover information you have already looked at or tried...Since I do not know if you have that manual I'll give you a few items to check...

Measure the battery at the units power connector...Must be at least 11 volts DC...In portable mode it uses 8 D cell batteries= 12 volts
Make certain the Transducer is securely connected...
Did you use the in-line fuse supplied with the unit?...
Try the Manual Depth Range...First turn off Auto Depth Range...From the sonar Page Hit MENU...Down-arrow to Auto Depth Range...Hit ENT...Hit Up-Arrow to Depth Range...Hit ENT..
And the Depth Scale Range appears...Up-Arrow or Down-Arrow to select a different depth range...Hit Exit...The minimum depth the unit can read is 5 feet...

If you do not have the PDF guide, here is the link...

http://www.eaglenav.com/upload/Eagle/Documents/Manuals/seafinder320df_0143-661_101602.pdf


Let me know how you make out....Guru....Saailer

Sep 11, 2011 | Eagle Fishmark 320 Portable Fishfinder

1 Answer

The unit will not show a depth reading - just shows 0 0?


Try adjusting ur puck,and go into menu look for a shallow,fresh water setting.less than a 100ft put in shallow all other depths in fresh

Sep 11, 2011 | Eagle Fishmark 320 Portable Fishfinder

2 Answers

Eagle fishmark 480 - worked fine for a while. Now when I press the power button I get a very brief flash of light on the screen and nothing else. It never comes up. I tried soft and hard resets, no...


This is the contact that I found on the net "Call Luke Morris, Lowrance, 918-438-8710, this guy works for them. Mondays is a bad time, he is hard to get ahold of, keep trying.", and with my research and my experience I suspect a bad power supply... If you have electronic skills, you could open it and check for swollen capacitors, specially on the power circuit board and replace them... (it's worth a try)

Good luck!

Jul 04, 2011 | Eagle Pack FishMark 480 Fishfinders

1 Answer

I've purchased an Eagle 320 fishfinder 2 years ago and I've had to replace my transducer twice. Every time I'm out fishing lakers in 50 to 100 feet of water, I keep loosing the bottom mark and...


I have never heard of Eagle Fishfinders, but I would be inclined to package it up and send it back to them for checking under warranty, with a fault that should never happen. The brand leaders are Lowrance and Humminbird, with Garmin in 3rd place.

I have a Humminbird 998HD with Side Imaging. I had a 798SI before that and never a problem. the 998 cost me nearly 2 grand Canadian and is used on Lake Ontario, twice a week every week from May to October, and has been faultless. The 798 was used from 2008 to 2014 and also faultless. I think you have a 'Friday Special'.

Mar 14, 2017 | Eagle Fishmark 320 Portable Fishfinder

1 Answer

My Eagle will no longer read the bottom beyond 50 ft, even with the boat stopped and the outboard turned off. The voltage is listed at 12.1 volts; there are no kinks or cuts in the trasnducer cable.


It seems most likely that your manual range has accidentally been set for 50' or less. Go into the menu and set to auto range. Here are the exact keystrokes as shown on PAGE 51 of your manual:
MENU> scroll down to DEPTH RANGE> ENTER> Exit

If this doesn't work, try doing a ful reset, as shown on PAGE 64 of your manual:
MANU> MENU> scroll down to RESET OPTIONS> <- to YES> ENTER

The Fishmark 320 is an excellent unit, and it works great in full-auto mode if you have the transducer mounted properly. Let us know if this doesn't fix your problem.

Dec 13, 2009 | Eagle Fishmark 320 Portable Fishfinder

1 Answer

Sonar does not appear to work - not picking up depths or bottom structure. All other functions look good.


This problem is most likely linked with your transducer.

1. Check your transducer cable and make sure the plug terminals are clean, as well as the plug on the back of the unit.
2. Make sure the transducer cable is plugged in correctly and securely.
3. Make sure the transducer is in the water and mounted according to the directions, parallel to the bottom of the boat
4. Turn the unit on while the boat is in the water, but with the engine OFF.

IF it works when the engine is off, but vanishes when the engine is on, you may be having electrical interference.

IF it works when the engine is running, but vanishes when the boat is moving, it is a turbulence problem. Move the transducer.

IF it does not work at all, try borrowing a new or a "known good" transducer and seeing if it works then. If so, replace the transducer.

Let us know if these work or now.

Oct 15, 2009 | Eagle Fishmark 320 Portable Fishfinder

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