Duncan, On guard means just that. They're saying that the other pilot talking is on guard (guard being another name for the distress frequencies) and they would like him to get off.
Kit D'Rection: Practise gets in the way does it? Then why pray does everyone have to practise their reaction to emergencies in the sim or otherwise? It's so that they react perfectly every time!
As others have said, including the man at the coal face, emergency practise is important for everyone. Anyone who thinks otherwise is only a step away from having a problem. Yes there should be a practise VHF emergency frequency to stop guard getting cluttered, but nothing will happen until enough pilots and only pilots complain about it. You can't ban it entirely because, I believe, it's a syllabus requirement (?).
Having spoken to the guys in D&D you'll find that all the airliner mates chatting to each other on guard and manging to forget which frequency that they're supposed to be on is annoying. Not the guys who actually want to practise their emergency reactions in order that they know what to do in a real one.
NavRad, one thing for you. Have you seen how far outside the promulgated cover for the 121.5 MHz system you are in Morecambe Bay? You might be surprised!
