Hi,On a flight this evening from LPMA to GCTS, cruising at an altitude of 180 (and TL 180) I suddenly noticed something at my FMS that I had not seen before. The FMS screen changed every let's say 2 seconds from speed readouts (at the way points) in KTS to MACH and back. And, even more astonishing, the altitudes, when indicating kts, were negative... !See the attached screenshots. Any ideas whether this behaviour is intentional?? Regards,KiekEHAMhomepage: http://home.planet.nl/~nwkaan/

Do you by any chance use FSMeteo ???George DorkofikisAthens, Greece

HiYou`re right at the Transition level that is default.Either change the transition level or climb above it or decend below.

Negative, Sir...KiekEHAM