No AP rounds in GW or NYGM as they were not used "at all" in the Ubootwaffe.
The piece of wood thing is a stopwatch you can pull it down click and hold and drag it down. You cannot enable it but when you shoot torpedos via periscope or UZO and drag it won on which ever screen youŽll see the time go by and the estimation of impact like in the peri/UZO screen.
Hope this helps
CT
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