Question about Lowrance LMS 332c Mapping Sonar/GPS Receiver

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I have a lowrance 522 igps and the unit has stopped rading the depth when I get into about 20 to 25 feet of water or deeper, this does this at any speed, the unit is alitle over a year old and has worked great up until about the last week

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  • eastwind63 Aug 12, 2008

    I think I fixed it, With the unit off, I held in the Page button and at the same time held the power up button until the not for navigation screen popped up, This was supposed to have reset(reboot) the unit. I now longer have the problem. Also they say that you can hold the zoom in and out together and the power up button, this will also help BUT you will lose your saved items including waypoints.

  • eastwind63 Aug 12, 2008

    I reboot the unit by holding in the page button and the power button together unitl the unit powered up to the not for nav, message, this reset it and it works fine now, can also hold the zoom in and out and power buttons together, youw may lose your way points.

  • FL_Crappie Mar 13, 2009

    I have a similar problem with my 332C and when I did the recommended fix nothing changed it continues to loose the debt. The screen will go from 0 to 500 feet then goes white with little small specks and on the right side of it will go up and down the debt scale. It just keeps doing that, then all of a sudden, it comes back on working fine for awhile. I thought it was just the transducer but when I put it on my old black and white unit, it works just fine.



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I would verify that your "chart speed" is set to 100%.


Posted on Mar 25, 2009


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Hello. Your observation is spot on and it is actually a characteristic that is always true when using sonar. Yes, your Lowrance uses the same sonar as a nuclear powered submarine does. The two factors you focus on, water depth and boat speed are perhaps, the two biggest factors when it comes to the quality of the fishfinder. The boat's engine should be in gear at an idle or just above. Experiment with your boat to find the best throttle location for good arches. Usually, a slow trolling speed works best. The depth of the fish can determine if the fish will arch on the screen. If the fish is in shallow water, the fish is not in the cone angle very long, making it difficult to show an arch. Typically, the deeper the fish, the easier it is to show an arch.
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1 Answer

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X510c most of the time it reads 1.6 for the depth, it flashes 1.6 then it will go to the correct depth for a shqrt time then get stuck on 1.6 again some times other depths but mostly 1.6

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The X510c will have problems keeping depth in shallow water...especially if it is muddy, weedy down there.

If the problem occurs even in depth over 20ft, then try resetting the unit:

1. Turn unit off
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If the problem still occurs, make sure the transducer is clean and still mounted so that it is sending the signal straight down to the bottom.

If the problem still occurs, make sure the power is good. You can have the voltage displayed on the screen through the overlay data menu.

Does the problem occur at any speed? If the problem clears up when you stop or slow down, the problem is due to cavitation and the transducer will need to be moved to a location where it is in a smooth flow of water at all speeds.

If none of this helps, there may be a malfunction with the X510c. You can try to update it but you will need to get the software update from someone at Lowrance support and then find a way to connect your X510c to a Lowrance unit that has a memory card slot via a NMEA 2000 network. I can help you with this if you need.

Other than that you can have the X510c returned to the factory for service.

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