fire solution for rear tin fish tube???

[aloe1]

I went to fire my rear tube at a ship and using the fast 90 advanced targeting i came up with an angle for the solution with the protractor . How do you get the reciptical angle that is going to be bigger than 360 degrees ??? ie the opposite to your angle solution??

[Corsair]

If you used the 90 targeting, then you set 90° AOB on one side at bearing 0°.
When you select your rear tube and turn your scope 180° you will get the same gyroangle.