Interference from prop wash

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Sean,

Should the MFD not have been updated with the latest available Raymarine product software update then its software be updated accordingly, as improvements in the fishfinder feature have been introduced throughout the the history of the a/c/e/eS/gS-Series MFDs. Should the problem persist thereafter, then you may want to consider sending the MFD to Raymarine’s Product Repair Center to be bench checked / serviced. As an immediate means to work around the issue, try switching from auto range to a manually configured range which is slightly deeper than the water being operated in. After the sounder reacquires bottom, then sounder may once again be configured for auto ranging.