Also, the forts have very good eyesight. They can see you even if there's a lump of rock in the way. In this case, the lump of rock is called St. Martin. If you sail into Marigot under a French flag (and don't do anything piratical on the way
), Philipsburg fort notes you as French. If you then sail away, raise a Dutch flag, and try to sail into Philipsburg, the fort will attack you. In my case it's the other way round - if I sail into Philipsburg under a friendly flag, then pull away, raise a French flag and try to enter Marigot, I'm attacked. And that's why, when Ardent has to visit both ports, someone in Philipsburg recommends the tunnel.