Some years ago, my yacht had a 'little' lightning strike, and the effect to my complicated electronics was extensive. I am an EE, so I have fixed most of the items myself, and made an interesting project out of it!
My observation was that the ground side of the power input circuit was the only damaged item on the sensitive electronic items (B&G displays, NMEA multiplexor, fridge controller, almost anything with a status LED, etc.) A change of the input diode or regulator fixed many things.
I don't want to start a debate about protecting a boat from lightning, as I think it is pretty much impossible. But I can confirm that I have a heavy copper connection from my keel-stepped mast to my lead keel.
Now that I am re-wiring to accommodate my lovely LFP batteries and new Victron system, I am considering adding an isolated DC-DC converter to a small 12V battery to drive all the electronics. My main objective would be to have a "floating earth" for that separate system.
I am hoping that the DC-DC converter would die 'when' I next get struck, and it would save all the other electronics.
Would this be a likely case? I don't expect any guaranties, but wondered if anyone could comment that this is a possible path to go. Given that I am redoing all the wiring it is not a big issue to isolate the "Electronics GND wire"
Thanks for your thoughts..