It took me an embarrassing amount of time, to realise. That I wasn't supposed to center the targeting system, over the objective numbers. The arm only works, if the objective marker is on the sides of the square.
I honestly think this is a bug in the latest version. I did indeed try to go for arm that is specifically misaligned to the cockpit, but tried removing that later on. I guess I didn't manage to fix it 100% Thank you very much for playing and checking out the game <3