I have had 3 standby type compasses go tits up.
1 fell off mid flight and I was more concerned about it jamming the rudder pedals.
1 decided to piss fluid everywhere (reckon the FO belted it with his knee board)
And the last one started omitting smoke during the cruise when we turned the panel lights on. I presume because folk had been using it to jam charts behind for a glare shield screwing with the power supply wires.
And I use user waypoints for center fixes and cross check the lat/long with the plate to make sure its reasonable.
He's right of course but Concorde ops are a world away from light FW GA
There really not you know Peter although concorde is proberly the furthest away from GA aircraft in the civilain world 99% of the stuff that the pro's do is exactly the same as if you were flying privately. Hence why there is no distinction between a pro IR and a private one.