Mmmh, the Typ IX D2 needs 150m from flank to stop (with reverse flank), i think this is quite good, a Destroyer at 30kt needs 250m in real. In Ports there are the Mooring Lines needed, to take any Movement out of the Ship. Unfortunately we have not any.

So a little Movement left.

Christmas Islands
You can try the Submerged drag, but i have never test any Changes there. So write down all Changes.