I am finding that when flying below the transition altitude under Centre control, the controller calls with an altimeter check every 10 miles. My understanding that this should only happen every 100 miles or if there has been a pressure change. I am using ActiveSky 1.85 and RC3.01 (the problem was not apparent when using RC3.0) with transition levels set at 180.RC is a great programme but the too frequent altimeter check calls I am experiencing are a frustration. As I have been unable to resolve the problem myself, any help would be appreciated.

did you set your pressure transitions in fsuipc to the activesky recommended values?is the pressure actually changing by more than .02 inches every 10 miles. that is enough to trigger an altimeter calljd

Hello JD - yes, FSUIPC was the problem. I set it up from memory and got it wrong!!!! Very sorry for wasting your time.