Remembering from my Chipmunk days (WD292 and WP900 where are you now?), exactly as Fitter2 said, with the added complication that when flying in IMC, having to look down at the compass could induce vertigo.
In the case of the mirror compass, that wouldn't be a problem, but then you have to deal with the mirror-image issue.
Did military Austers have a mirror compass or was it on the floor like the Chipmunk? [Edited to say if I had re-read the first post, I wouldn't have asked this question!]
I42
Last edited by India Four Two; 29th May 2009 at 14:03.