Originally Posted by
MurphyWasRight
That reads exactly like dead reckoning using a compass to me.
Indeed. I may have misread Vilters, who didn't actually say "only a compass". For dead reckoning you compute the wind triangle using a compass, additionally you need information about wind speed and true airspeed. Which the compass obviously does not provide.
Anyway, GPS provides heading information anyway, in addition to whatever else information you need, so I am not sure I see the point. You use whatever instruments available to tell you where your are and where you are headed.