Ok no problem, but stadimeter was present in real uboat so its use in the game is a little more authentic as raobf dics. :-)
the use of the torpedo speed boards (or aob 90° boards) at F3 view are fine too (there are 3 boards 30knots-40knots -43knots). very easy : just calculate target speed and you can fire :-)
here a small good tuto for the fast use of raobf discs :
1-look at the target and retain the bearing "X" (
don't lower the disks now but well retain the bearing)
2-then take the 2 measures fast enough (high and lenght of the ship) with the reticles at bearing "X" (raobf discs are not lowered so the persicope view is wider and the use of the reticles is easy)
3-then evaluate the speed of the target (not obligatory at bearing "X" you can take your time to good evaluate speed wich is the more important value, there are several ways to calcul speed for exemple with ujagd stopwatch is nice)
4-then go again to bearing "X" you were before (no matter if you don't see the mooved target in the periscope anymore), lower the raobf discs and calcul by taking your time value of distance and aob with the measures (high + lenght) you take before at point 2. when it is done raise raobf discs.
5-remain at bearing "X" periscope view, enslave OFF TDC, enter the 3 values (distance, aob, speed) in the TDC, enslave ON TDC.
Now you are ready to shoot the target whenever you want.
Have fun
