Jake yet again said:
Seeing as Aquatic rarely affects the game outside of the Mythos Phase it might be better to change the middle text to All Streets and Unstable location count as Aquatic locations . Sure it means the Sailor gets a boost, but ti cuts out the need for the second paragraph.
I have to admit that since I don't yet own Innsmouth Horror, I was not familiar with the Sailor's special ability. I think I'll make the change you're suggesting, and I'll try to think of whether adding something else might spice things up some more.