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Old 17th Oct 2007, 03:09
  #4 (permalink)  
Tinstaafl
 
Join Date: Dec 1998
Location: Escapee from Ultima Thule
Posts: 4,273
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Think of it as two different problems: The first problem is how to correct a track that is drifting from the Desired Track so that it is no longer deviating ie parallels the Desired Track. The second problem is how to correct a track that is parallel to the desired track ie the Heading is correct but the aircraft's position is offset from some point on the Desired Track where you'd like it to be.

First problem: Stopping the drift away from track. Use Distance Run from where you last paralleled track (usually the last point you were happily proceeding along that desired/planned track). Turn towards the Desired Track by however many degrees you get from this 1st part of the 1:60 method.

Second problem: You've successfully stopped any further drift and now wish to regain track. Use Distance to Go to whatever the position is on the Desired Track that you'd like to regain track. Turn towards track by however many degrees this 2nd part gives you. **Don't forget to remove this second Heading adjustment - but not the first adjustment - once you've regained track**

Note that you don't have to do both parts at the same time. You could solve Part One only so that you parallel track for a while, and then, some time later, do Part Two to regain track. Usually, however, both parallel & close track problems are done together to save buggerising around twice. After all, the only difference is whether you use Dist Run or Dist to Go, respectively.
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