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Frank, I'm told that a Faraday cage will protect the contents from common 
flashover and the currents caused by lightning--but not from the EMP pulse. I 
have no idea if that is correct, only that magnetic shielding and a common 
faraday cage are two very separate things.

Common ham radio practice is to ground all antenna leads (even though they are 
lightning protected) and disconnect the equipment from all power and antenna 
lines, to prevent spikes from getting in via any of the wiring. But again, 
that's not EMP protection and apparently a lightning flash that travels 
through your boat will generate a good EMP pulse.

Possibly a heavily constructed Mu-metal box would do it, that absorbs magnetic 
fields very well and is used to shield from them. Second choice, an iron 
ship's safe.

   

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