New to me 2013 22 ft bay boat with 9" hybrid touch chart plotter. Intermittent loss of depth in shallow and/or deep water, stationary or at speed. Technician informs me I have 200 megahertz transducer. Going to be serviced next week. If transducer the problem, should I replace with 50/200 megahertz and which model number. Will be fishing both keys back country as well as deep 50-200 water. Thank you
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