OPTION B - Determining Scope Bearing Using Computation
Once again, for the mathematically inclined, you can forego using the mapping tools and instead do a quick calculation to determine what bearing you need to point your scope at for calibration:
Scope Bearing = Perpendicular Course to Target - Current U-Boat Course. If the result is a negative number, add 360.
EXAMPLE: From the Fast 90 Basic Section, we computed a Perpendicular Course to Target of 326 degrees. Our current U-Boat heading is 013 degrees. Thus, 326 - 013 = 313 degrees.
Step #5: Calibrate Scope & TDC
With the result obtained in either Option A or Option B above, enter your scope view and set your scope EXACTLY to the result obtained:
Above: From the results obtained in Step #4, the scope is set to 313 degrees.
Next, go to the TDC. Here you will manually set the AoB to 90 degrees PORT or STARBOARD depending upon which direction you are approaching from.
Click the Red Manual Solution button so it turns Green. This tells you that you can now change settings manually. Next, depending upon whether you are approaching the target from the target's port or starboard side, move the ANGLE ON BOW needle until it is 90 degrees on either the PORT (Red side) or STARBOARD (Green side) of the gauge:
Above: Angle on Bow gauge set to 90 deg Starboard
Step #6: Final Target Observation
This is identical to Step #5 in the Fast 90 Basic Section. If you need a refresher course, please go there.
Step #7: LOS!
Take the shot!