The rearview picture gets the setup overlay whenever the marine VHF transmits. It appears to be RFI from inside the pilothouse's navigation console. Turning off the VHF's breaker, which also powers the cameras, removes the setup screen. Since neither ham radio affects the video, I suspect the RFI is getting in via the common VHF/camera DC power breaker.
The wiffelballs worked today to keep the coolant from escaping.
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