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Lms-520c sonar not correct -sometimes just flashes same depth,depth way off at times from another correct sonar,colors wild. GPS works great.

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SOURCE: Lms 520c 5" Screen Color External Gps And 200 Khz Sonar System: I have a Lowrance LMS 520C on my boat. The GPS wi...

I have the same problem on my 520C.
I have no solution but I hope you have find some?
Best regards
Dan

Posted on Oct 31, 2010

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LMS 520c back light not working


the light switch is in the power up button...turn the unit on let it boot up then push power button to set light as you want it do not hold down power button that will just turn unit off.. push the power button just one time if you want light brighter push till you get the back light you want

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Flashing screen


two things can be taking place 1 you have a bad key pad 2 you have a bad transducer(short in wire )

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I have a lowrance LMS 520c and I never pick up any fish. it does show the bottom


read the book that came with it you got to understand how it works and know how to set your unit before you can understand how it works and what you need to do to make it work and to get to what settings you want ..a fish finder is like a computer you got to program it to your likings .. I have a hd 10 structure scan on mine .. .now that's a nightmare to set but the book tells you everything you need to do and how to do it and how to get what your looking for and how to get to it

Jul 28, 2013 | Lowrance Lms 520c 5" Screen Color External...

2 Answers

Lms 520c 5" Screen Color External Gps And 200 Khz Sonar System: I have a Lowrance LMS 520C on my boat. The GPS wi...


I have the same problem on my 520C.
I have no solution but I hope you have find some?
Best regards
Dan

May 07, 2010 | Lowrance Lms 520c 5" Screen Color External...

2 Answers

I purchase a lowrance LMS-520C about 18 months ago. The depth gauge cuts in and out. It works for a while then defaults to 3.3 feet while trolling. Can you point me in the right direction to find the...


Quite often those transducers go out. Not 100% sure but would bet money on it. Call Lowrance customer support and see if the offer any more advised but more importantly see if they can replace your current one as a replacement instead of you having to pay full retail price. I purchased a new gps module through customer support and saved $150 off the normal retail price. Best time to call customer service is at 8:15am central time when the lines are turned on!

Feb 28, 2010 | Lowrance Lms 520c 5" Screen Color External...

1 Answer

I have an 1997 540i BMW, and I need to know the price on a disc for a GPS system or where to get one.


I have seen these listed on craigslist from 200 to 400 dollars. I do not know a store that carries them in stock other than the dealer may have it but you will pay threw the nose for it.

Feb 12, 2010 | Lowrance Lms 520c 5" Screen Color External...

1 Answer

Sonar inop at most times . onec in a while it works fine


(1) bad transducer. (2) bad ground from unit to battery. The cable next to the battery will have no effect.

Sep 05, 2009 | Lowrance Lms 522c Sonar Gps Chartplotter...

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