On Aug 7, 5:42*am, Andy wrote:
*We use 0.25 statute mile in US and that is a
smaller radius.

John Good's blog now has the explanation I, and I'm sure many other US
pilots, had been waiting for.

http://www.usteamluesse2008.blogspot.com/

0.5sm is of course larger than 0.5Km.

Tough way to lose points.


Andy