I like to park my boat beside the Large Sea rocks while sailing, like the one down at Z26 for example, because it's secluded and makes fishing Devil Fish a peaceful experience :)
I anchor the ship like normal to stop it from moving away while I fish, and not 5 - 10 minutes later the boat has done a complete 180 and is facing the other direction.
Or sometimes I'll park as close as I can get to the rock (Mainly for protection against the Sea Volcano at Y25) and despite being anchored, the boat will sometimes just float away from the rock.
Does the Anchor not work while close to these rocks?

