Hey,<br /><br />Have a Lowrance LCX-18C Fishfinder/Chartplotter with the dual frequency skimmer transducer with temp/speed. For the last two months, the unit hasn't been able to pick up depth and shows 0'. It picks up the temperature and speed fine, though. It also recognizes the dual frequency transducer connected, and works fine in simulation mode. I tried cleaning the bottom of the transducer, but still made no difference.<br /><br />any suggestions? <br /><br />thanks.