What exactly does the gyro do?

[Waervyn]

Heya!

I just bought and modded the game to Wolves of Steel.
Excellent stuff!
I did the Four Bearings tutorial, which was really great, really really helpful.

However, I was a bit confused at the end.
Basically you line yourself up to be at a 90 degree angle with your target, and set the speed of the target, as well as its angle from you (90 degrees).

However...afterwards, you need to put your gyro's on double 0, and fire when the target is in your sight...but I have no idea why! What does the gyro do? Why does it need to be put at double 0, and why don't I have to put in the distance to the target? Speed of the target and the distance towards it should influence whether I miss or hit right?

Thanks a lot for your time, and thanks to everyone for the mods. If I keep playing this game I'll be sure to donate (have to leave for 2.5 months tomorrow, so can't really explore the game much unfortunately )

Cheers and thanks again!