The retractable Airmar DST800 is not reading true speed. There is approximately 50% variance between the GPS and Tacktick displays. Too much of a difference to be accounted for currents. It worked fine until I removed it for cleaning. I suspect it is not going in all the way when reinserted resulting in the paddle wheel not getting the full benefit of the flow. Has anyone had a similar experience with retractable transducers?
