Charles Cox wrote:

I believe "unintentional radiator" marine electronics are exempted from some of the (Section 16?) regulations, ...

Yes, provided they do not interfere with any licensed radio service. FCC
regularly cites owners of everything from electric fences to public
power companies for interference. These typically inform the owner that
he must fix the device, shut it off, or face $1000+ per incident fines.
Of course if y'all own the interfering device ... (c: