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***Chuck - Raymarine - Moderator***

Welcome to the Raymarine Forum Slopecop,

Unlike the cases of Raymarine MFDs, the cases of Dragonfly displays are permanently sealed. When submerged under the conditions which you have specified, water likely entered via the display's power/transducer interface or chart card reader. It would be recommended that you try removing the chart card reader's cover to see if you can get any of the water out via the reader and/or leave the chart reader cover off and place the display in a low humidity environment for period of time long enough to permit no water movement sound to be heard from within the display.