It is a bad transducer. Marcum was purchased by nature vision. Give customer service a call at 866-777-0733 and they will help you out. I have not delt with them since the take over but from what I have heard they have been taking care of people. Please let us know how it turns out.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~ Chuck Clark