I continue to question whether systems free of the electric grid are good targets for an EMP. The grid and anything connected to it are very susceptible due to the large collection antennas otherwise known as high voltage transmission lines. However, boats and ships underway are not connected to the grid. A ship may have enough antennas to damage some of the communications gear that is connected, but does that mean other systems on the ship will also fail. How many amps can be collected from a simple HF whip or even long-wire?

That said, your drill is still good because total electrical failures can and do happen. Thinking about work-arounds for critical system failures is a good thing.