On Jul 12, 6:05*am, Sam Spade wrote:
Les Izmore wrote:
Am I missing something here?

What godly difference could it make whether you track a magenta,
white, or fuschia line on a GPS screen, or have the OBS set to 90 or
270?

It does so long as you are hand flying or using heading mode. *Some
autopilots won't understand it in some cases though.

Like flying a back course perhaps?

Exactly, since you set 090 on the OBS but you are flying 270, you are
going 180 degrees
in the "wrong" direction on the bearing TO the VOR. You are flying
FROM. Off course, the
autopilot or GPSS will try to turn you all the way around.