First, I put the best HUD in the game in your aircraft

I set it up as "hidden" so it won't be in your way as you build

You will see it when you launch your plane

NEVER shrink the HUD ! It won't operate correctly if you shrink it

FYI, The camera's X & Y coordinate MUST remain the same as the HUD's X & Y coordinate

And, the HUD's Z coordinate must be .447736 greater than the camera's Z coordinate in order for the HUD to operate properly

The HUD

You will see a tiny diamond shaped reticle over the top of the target plane

The tiny diamond shaped reticle will turn red and lock over target upon Missile lock

The HUD also has an anticipation reticle for the cannon

The anticipation reticle will show you where the target WILL BE, & this is where you aim

The HUD also has the degree lines that will adjust as your aircraft climbs or dives

The reason all these HUD functions work, anticipation reticle, tiny diamond shaped locking symbol is because of the programming I did in the variables screen