While sailing the seas of Avonmora I've had my fair share of plunders and danger. About a year ago I found a way of losing my danger.
1. I drop my gold to 0
2. I attack a fleet through skirmish/allow a fleet to attack me(this means that I am not removing their danger)
3. I have 5 separate tabs open with commandeers ready to be cast on the ships.
4. After I skirmish/get attacked I quickly commandeer back my ship.
5. Put them back in a new fleet. No danger.