I bit the bullet and steamed all the way from the equator to my assigned patrol area, ignored all possible targets on the way until I came to my Planquadrat, where I started to play as usual. After a decent patrol I docked again at Trondheim.
A few minutes ago I started the next patrol, and all seems fine, starting in the harbour of Trondheim, as it should be. No signs of beaming atlantians anymore