The AOB wheel adjusts the target's angle off the bow ... which changes constantly. The TDC target wheel uses target heading. Witout the mod, there is no method for setting target heading without making one adjustment after the other with the AOB wheel. In the default game, you end up "chasing the AOB" to get a proper heading. And, if you take another stadimeter fix, it all goes wanky again.
The mod gives you the option to adjust AOB and, while doing so, adjust the target heading in the TDC ... both at the same time. Without continually readjusting and then sending AOB.
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