The missile knows where it is at all times. It knows this because it knows where it isn't. By subtracting where it is from where it isn't, or where it isn't from where it is (whichever is greater), it obtains a difference, or deviation. The guidance subsystem uses deviations to generate corrective commands to drive the missile from a position where it is to a position where it isn't, and arriving at a position where it wasn't, it now is. Consequently, the position where it is, is now the position that it wasn't, and it follows that the position that it was, is now the position that it isn't.
In the event that the position that it is in is not the position that it wasn't, the system has acquired a variation, the variation being the difference between where the missile is, and where it wasn't. If variation is considered to be a significant factor, it too may be corrected by the GEA. However, the missile must also know where it was.

-rep After a good game in csgo, i added him because he seemed like a cool guy. We got chatting, over the next couple of months we became good friends. Lots of banter, lots of great CS and most importantly true friendship.
I invited him to my house for a csgo lan party. He said he was coming so i was looking forward to meeting him in real life.
When he arrived at my house, he pushed me against the wall and started nibbling my ear, i felt his hard ♥♥♥♥ push against my leg. I punched him and then 1 tapped him. Turns out he was gay. Don't trust this guy.

awooga lets go lets go ogog ogogog opgall fall guys :smileyface: :D

YOU HAVE A HEART OF GOLD, DON'T LET THEM TAKE IT FROM YOU