However, it is sure where it isn't, within reason, and it knows where it was. Because a variation has modified some of the information the missile has obtained, it is not sure just where it is. The missile guidance computer scenario works as follows. However, the missile must also know where it was. If variation is considered to be a significant factor, it too may be corrected by the GEA. 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.

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. 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. 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. It knows this because it knows where it isn't. The missile knows where it is at all times.

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