Here's one for U all. 530s.

Or as we learned in Melborne FL, home of the 27
Back Course LOC approach, all-y'all is the plural.

When selecting VLOC mode, the thing behaves correctly
on a BC approach... you set the ILS FRONT COURSE on the
yellow arrow HSI course datum, and inbound on the BC,
the tail of the arrow is up and there's no reverse sensing.
Just as we've been taught.

And there's no automatic switching to VLOC.

But while inbound on the GPS lead-in to the LOC, it
looked like the sensing was backwards at least in some
of the airplanes.

On the simulator, it looks like the GPS sensing was
also reversed so that while on "gps" tracking in the
vectors to final mode that the HSI read correctly--
while dialed to the front course heading--as it would
be in anticipation of the BC approach.

One customer asserted that they sensed the BC out of
the approach list and reversed everything--dial in the
BC inbound heading on the HSI. This did not make sense
as it would completly fake out the autopilot.

Anyone have the authoritative word on this?? Couldn't
find it in the Garmin documentation. Hadn't run into
the problem before. Versions?

I just told 'em to aim at it on the map.

Bill Hale BPPP