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The inertial guidance system
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 Inertial Guidance System is the deviation to generate corrective
commands to drive the aircraft from the position where it is to a
position to where it wasn’t. It is now consequently where it wasn’t
at a position to where it was if the position is where it isn’t.
The thought process of the inertial computer is as follows: Let us
assume that the system is not sure where it is, however, it is sure
where it isn’t. Within reason, and it knows where it was, it now
subtracts where it should be from where it wasn’t, whereby or vice
versa, and by differentiating this from the algebraic difference
between where it shouldn’t be and where it was, it is able to obtain
the difference between its deviation and variation and is thus able
to obtain its present position.
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