Joseph B. Reid wrote: >The rest of the world follow American rules because >of the dominant position of USA in aviation.
As I said in my previous posting: For aviation horizontal distance: The rest of the world uses SI (metres, kilometres) or SI-accepted measures in aviation for horizontal distances. For pressure: The rest of the world uses mb or hectopascals. >These are recognized by ICAO as temporary exceptions; >the blue book, if I recall correctly. The 'Blue Table' is no longer in force. It was replaced in 1979 by a 'non-SI' list. This does not contain any allowance for the non-SI or non-SI-accepted measures in use by the US for horizontal distances. Here is an example of UK aviation weather (note the different units used in vertical and horizontal measures): Surface wind 360�/3 kt Visibility 1,200 metres Weather Snow Cloud Scattered base 400 feet Broken base 800 feet Temp/Dew point 1�C/0�C
