Is it possible that this quest is bugged sometimes? We had a spot were the sunken ship should've been with seguls all over it but there was nothing. My crew and i searched the whole Map around that place but we couldn't find the sunken ship. The last hint was somethingn like:
The swirl is crushing us to pieces
We sailed close to the wind to reach our destination but we cannot make it...
I assumed that means from that last position in a clear line to the destination: there should be something...
Nothing all around...
"we