When you look thru the periscope you see only the "optical" part of the SH4 periscope screen. There is a mask on the front of the periscope cut to match that view. About like this -
To see the other parts of the SH4 periscope screen you have to look around to the left or right of the simulator periscope.
My goal is to "focus" your view and experience to that very limited view of the outside world like on a real sub.
The flight yoke below the periscope is programmed to control the Observation & Attack scope functions. Raise/Lower, Pan/Tilt, and Fire.
Tim