[DG] [DG11] Dragonfly Dirty Screen

[Derek - Raymarine - Moderator]

Hi detroix,
Thank you for your message,

is it possible that the unit is actually showing real targets - i.e. a lot of "life" in the water column? It is one possibility we have seen before, it appears to happen at specific times of the year depending on climate and seems to be caused by Algae or plankton streaming through the water column under the boat.

Alternatively, the 'noise' is from something else. I understand that you have tried it with the engine off, but I wonder if you have tried it as a "dead boat" scenario, with everything turned off - even trying with a separate isolated battery?

Looking through the software history, v12.20 only seemed to change the UI to allow a CPT-S to be connected, and hide the DownVision channel (since you didn't have one). There are no changes to gain etc.

Regards

Derek