Guard blah blah,
just for information, if you transmit anything on 243 in UK they can DF you to within a couple of miles. Very handy for an emergency but also explains the reluctance to blabber away on guard.
Guard freq is 243 as far as I'm concerned and 121.5 is the civil distress frequency, just as 5696 HF and channel 16 (or is it 69) on marine VHF. Regardless, someone overtransmitting mayday calls on any if these is a bit dangerous, and annoying if you are the one transmitting the mayday!
