bookworm
<font face="Verdana, Arial, Helvetica" size="2">I'm amazed that you regard the three types of approach as similar. They have vastly different user interface </font>
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I was thinking of a vastly
similar user interface ie a needle pointing in a direction, but I accept this is not always the case.
A hold starts with you homing in on a set needle direction. Then you set off into no-man's land hoping you will manoeuvre some time later back onto your starting direction. The trick is guessing timings and drifts. Thus largely it doesn't matter which you use.
Well actually you are right. The GPS and VOR give you track, and thus drift. This is very helpful in guessing wind effects.
I once failed my IR because the wind was entirely opposite to forecast so I missed the hold timing by 20 seconds. With GPS or VOR perhaps things would have been very different.
