Haven't found any. But the manual covers about everything http://www.lowrance.com/upload/Lowrance/Documents/Manuals/LMS525CDF-520C_0151-461_120706.pdf 252 pages, you should be able to find answers to any problem you might have with the unit from there.
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Haven't found any. But the manual covers about everything
http://www.lowrance.com/upload/Lowrance/Documents/Manuals/LMS525CDF-520C_0151-461_120706.pdf
252 pages, you should be able to find answers to any problem you might have with the unit from there.