The boatswain was head of the deck service. His responsibility was the
navigational equipment, deck equipment, provisions and he was also the ship
cashier. When at sea dived, he was the planesman on port watch.
The second petty officer of deck service was the first helmsman, named 1.S
He was responsible for the artillery and mine provision. He was also
overseeing the sailors good behavior. At sea submerged, 1.S was the
planesman on starboard watch.
Signalling and control surfaces were managed by three men who also had other
The crew carried ships number Sknr. Sknr 1 was responsible for signalling
and health care. Sknr 2. was the boats carpenter and Sknr 3. was ”the
Steering was performed from the fin when surfaced and from the control room
Signalling was performed either by semaphore flags or with a morse lamp.
U8 Signalman semaphoring.
Photo U3 archives.