In a message dated 16/11/2006 15:53:05 GMT Standard Time, bones@xxxxxxx writes: Kohlsman? Dunno really, just some guy, you know. Inventor of sub scales. <g> bones I was all set to attempt this gauge in 3 phases - 1. Altitude gauge + Kohlsman 2. Add QNH and STD buttons to transfer values to Kohslman. 3. Add the altitude alerter. However, my Horizon VFR scenery has arrived, and Norman Dean has posted some fixes which look like the UK2000 scenery may be made to work after a fashion in FSX. I may be away from gauge development for some time........... Frank T.