Captured and flew the 6 degree glideslope during conversion onto DC9 51.
FD app, mod turbulence and icing on to 05 at GVA.
ROD wasn't always the clue as the alps are known for odd winds and shear -once lost 25 knots at 1200 ft on departure (with huge temp inversion), Heavy and rising terrain at night - not nice.
Outer marker check got it but initially thought it was an altimeter setting problem as flying QNH but had grown up on QFE.
Closed throttles, ordered FD off and intercepted the correct one.
broke cloud around 500ft.
Might sound hairy for the times but the company I was entering had abilities that did exist in my previous employer.(all of the training guys were ground attack/ fighter jet jockeys).