If you have ever seen the Australian designed Winjeel trainer it looks something like Piston.Provost. The Winjeel had a neat little E2 compass in the windshield area as a standby magnetic compass. Looked like a typical car compass that is held on by a rubber sucker. Some wag wrote that in event of a forced landing on water, the aircraft should be rolled inverted just before touch down so that it landed on the canopy.
The pilot should then jettison the aircraft and row away on the upturned canopy. However, there was a caution that the E2 magnetic compass could have gross errors when upside down. Well, I thought it was funny, anyway.
