ST60+ suite (Depth, Speed, Wind) ~four years ago. Airmark transducer new installation
. Worked fine till last winter, Boat hauled, repowered and splashed. Since then, depth
reads fine untill shallow water
, then reads ---, or 10.4 (LAST), or other random shallow reading. obviously not helpful. Transducer painted w/transducer paint
at haulout, subsequently scrubbed w/scrubbie. Display bench tested by Raymarine
and could not duplicate problem. Tested second transducer and problem persisted. Any ideas what would cause a problem like this welcome.