You should see the RAOBF ring at the very top of the screen at the periscope stations. The bottom edge of a dark grey ring with black numbers just above periscope lens. Simply click.
Selecting the various officer/station icons in the lower left enables the attack discs and AOB calculator to appear when you move your mouse to the top of the screen. Select the navigator icon and move mouse to top right of screen for AOB calculator.
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