Garmin/Avidyne OBS weirdness

I fly an SR22G2 with the Avidyne MFD. When I try to use the OBS mode on
the Garmin 430 in VLOC mode it works fine -- the left knob on the MFD
controls the OBS, it draws a nice purple line, and everything is hunky
dory. But when I try to use OBS in GPS mode the MFD doesn't work. I
can still set an OBS heading on the Garmin directly, but that's
cumbersome, and the purple heading line doesn't show up on the MFD. Is
this a bug? A settings problem? Something else?

Thanks,
rg

On Feb 27, 3:27*am, Ron Garret wrote:
I fly an SR22G2 with the Avidyne MFD. *When I try to use the OBS mode on
the Garmin 430 in VLOC mode it works fine -- the left knob on the MFD
controls the OBS, it draws a nice purple line, and everything is hunky
dory. *But when I try to use OBS in GPS mode the MFD doesn't work. *I
can still set an OBS heading on the Garmin directly, but that's
cumbersome, and the purple heading line doesn't show up on the MFD. *Is
this a bug? *A settings problem? *Something else?

Thanks,
rg

I think there was an article in IFR magazine about what happens when
you use the OBS button on the Garmin GNS430 and GNS530. Your flight
plan comes to a screeching halt and thus no output of current DTK. I'd
suggest getting together with your trainer and going over the use of
the DIRECT button to select a course to the waypoint. April 2004 issue
of Aviation Safety magazine has a write-up on it.