No, the 54th degree
(EDIT: Mea culpa! The mathematically correct angle should be 58th) tells the speed in knots after shiplength (in basis scale) is aligned with bow-to-stern time. It's an alternative to using the red yellow and green scales on the chrono. It has
nothing to do with calculating AOB or the actual AOB of the target. It just uses the scale to point to the right speed value. The
58th degree just means a value of
0.848 and is the result of conversion factors.
That said, I am working on a similar shortcut in the Range/AOB routine to do the x4 multiplication with the wheels when using the low power setting of the attack scope. If you consider that 0.25 (1/4) is equal to the sine of 14.47 degrees you only need to move the observed mastheight (in low power!) just below the 15 degrees (actually just inside the 'belly' of the 5) instead of 90 degrees and then you get the right range. Luckily the recognition book isn't too high up the scope for that. I haven't figured the AOB calculation yet. Need some more practice. I'm not sure if you need to multiply the observed halve shiplength also by 4. But even that won't be difficult to solve I'm sure.
So OLC, be prepared for another scratch! Did you add an indication of scope magnification? If so, I didn't notice. Anyway, scopemarks look good!
Compass wrong? Oh that's why I scraped the side of the dock!
