I do wonder how electrification of ships this will affect navigation for larger vessels. A retired friend used to captain container ships, and during some unrelated story, he mentioned being able to navigate one particular channel because the ship’s draft was higher in the water from having less fuel (the old “fuel makes you heavy”).

Batteries don’t have this feature, so it gets interesting: it could be that a less energy efficient route overall needs to be taken for some trip. If it results in less emissions overall, it’s obviously a win, but there’s some interesting subtleties to consider in this problem space that aren’t immediately obvious.