In a message dated 27/08/2007 12:02:08 GMT Daylight Time, bones@xxxxxxx writes: No. Unicom is the general frequency to use when no ATC is available but it is essentially a listening watch only. There is no need to say anything on Unicom unless you note an aircraft in your proximity. If it looks like a potential conflict may be likely a position report would be nice (position, heading, height) but keep it short. Pilots in China and the US wouldn't appreciate extensive verbiage on the channel. bones OK, that's pretty well what Paul said. Frank T.