(Ed. note: This comes from a current student, Dave Yell. You may well be able to deduce that Dave is British. In deed he held a Unlimited License there. He’s planning on doing some work here, which is way he’s in a class. I should note he is a fantastic resource.)
A man knows where he is, at all times.
He knows this because he knows where he isn’t.
By comparing where he is with where he isn’t or where he isn’t with where he is, he understands there is a Deviation.
His built in intuition uses Deviations to generate corrective commands to drive him 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 now is the position where he wasn’t and it follows that the position where he wasn’t, is now the position where he is.
In the event that his actual position is not the position where he wasn’t, his conscience has acquired a Variation.
Variation is the difference between where the he is and where he is supposed to be or where he wasn’t.
If Variation is considered to be a significant factor his conscience can generate corrective commands to drive him from a position where he is to a position where he should be, and arriving at a position where he wasn’t, he now is.
However, to achieve the above he must also know where he was. His built in intelligence creates a scenario that works as follows: Because both Deviation and Variation have been modified by corrective commands of his intelligence and conscience some of the initial position information that he obtained is now inaccurate.
Therefore, he is not sure where he is.
However, he is sure where he isn’t and he knows where he was. He now compares where he should be with where he wasn’t. By differentiating this comparison with where he should be with where he was and where he wasn’t with where he now is, he is able to obtain the sum of the true Deviation and Variation, which he explains as – ERROR.
– Dave Yell 2006
– Adapted from the Missile Guidance System explanation.
This post was written by Richard Rodriguez, Rescue Tug Captain, and US Coast Guard approved instructor for License Training. You can read more of his articles at the BitterEnd of the net.