Question about Garmin Fishfinder 90
More than likely the Sonar transducer has failed. Since Garmin doesn't release repair information to the public you will need to send it back to Garmin for repair or exchange, since the model is no longer sold they will most likely offer you a discount on a newer model of the 340C.. Here is a link to the out of warranty web page of Garmin.
Posted on May 25, 2011
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Posted on Jan 02, 2017
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