Psst. plese be silent, and do not disturb him. My XXI have a silent follower in the Night.
The Night View is optional, you can use or not. It s only in Typ XXI possible (DLC)
All other Boats, do not have a Night Vision Periskop.
you will meet here or there also Fishes, there a good Amount of this.
but : it s really luck, that a Shark is following your boat
best Greetings, Andy / Smoking Head Studio.