I have seen so many posts asking for PvE servers and many of them feel like there are frustrated pirates out there.
I know how it feels when you get sunk by others players and lose your treasure. However, this is just a lesson to learn how to improve and get better.
That's why I really encourage you all to be aware of your surroundings. This is the best tip to react to nearby threats. If you see a ship in the distance you can prepare to defend yourself or run away.
Doing a 360 spyglass view from a high place each 5-10 minutes will prevent you from getting surprised by a ship. You will have time to predict each movement the other ships are doing and this will guarantee a safe travel.
Hope this helps all new pirates out there!