[myself6]

I hate to tell you this, But as a former Navy Electronics tech 1st class, ALL critical naval electronic equipment is "hardend" against EMP.

[Poohbah]

The ship's hull makes a damn good EMP shield.

[DK Zimmerman]

Well, I'll admit I don't know the Navy systems. However, unless you have warning, have shut down, and disconnected the best hardening in the world won't do you any good as the pulse will come down your electrical and fry everything on the path (it acts like an antenna). In the Army's case, we have essentially gone to shielded cases in which to place stuff we REALLY gotta have. Only, what will we hook up to, if all generators and wiring are toast? Perhaps your hulls will help, but they could also hinder by "soaking up" the pulse, like wiring does.