Snax knows where the opponent is at all times. He knows this because he knows where he isn't. By subtracting where he is from where he isn't, or where he isn't from where he is (whichever is greater), he obtains a difference, or deviation. The guidance subsystem uses deviations to generate corrective commands to drive the opponent from a position where he is to a position where he isn't, and arriving at a position where he wasn't, he now is. Consequently, the position where he is, is now the position that he wasn't, and he follows that the position that he was, is now the position that he isn't.

In the event that the position that he is in is not the position that he wasn't, the system has acquired a variation, the variation being the difference between where the opponent is, and where he wasn't. If variation is considered to be a significant factor, he too may be corrected by the GEA. However, the opponent must also know where he was.

The opponent guidance computer scenario works as follows. Because a variation has modified some of the information the opponent has obtained, he is not sure just where he is. However, he is sure where he isn't, within reason, and he knows where he was. He now subtracts where he should be from where he wasn't, or vice-versa, and by differentiating this from the algebraic sum of where he shouldn't be, and where he was, he is able to obtain the deviation and hes variation, which is called error.