Not familiar with the CAPAC system -- but that system may aid in the lightning coupling to the onboard electrical system. It's all about how the EMP or lightning strike couples to the electronics; CAPAC may provide an easy path. Even if computer systems die, a disconnected laptop (inside the hull but physically isolated) may be a good back-up.

If you can make your ship more survivable to an EMP so that propulsion and steerage are still operational, then it's a matter of navigation and staying in the channel. In that case, staying with the ship may be your best option. At least you should be able to get yourself to a better location North of NOLA before disembarking for the hike home.