Michael,

I think you need to brush up on your Garmin GPS's. In the Cirrus, I
believe, the Garmins drive the Avidyne display. One of the navigation pages
on the Garmin displays a CDI that scales properly to approach sensitivity.
That is much more accurate than following the magenta line for a backup
approach.

Ron


"Michael" wrote in message Well, that's
a defeatist attitude. I would like to think that I would
come up with some method they could handle.

Just turning until the little picture of the airplane is pointing in
the same direction as the purple line might just be a reasonable plan

with today's cockpits.

In a glass cockpit Cirrus (at least the one I flew) it is the only
plan. A PFD failure leaves you with ASI, electric AI, Altimeter - and
two Garmin 430's without CDI's (the only CDI is built into the HSI
presentation on the PFD). The only approach you can shoot after PFD
failure is a GPS, and you can shoot it ONLY by turning until the little
picture of the airplane is pointing in the same direction as the purple
line. I suppose you could use a compass, but I'm not sure what the
benefit would be.