Inverted Flatspin:. .Many thanks for the detailed reply. I think I would usually pass the 6 feet test you mention. The amplification of radio and headset sounds quite promising; can you say more about the quality of the sound though - is there as much static and hiss as TV news / onboard cameras would have us believe?. .Usually, however, I use quite a bit of lip reading to assist when there is background noise. . .In the absence of lip reading sheer volume usually does the trick!. .Will look at CAA site and contact them. Thanks.. .. .Engine notes etc will present less of a problem.. . . . <small>[ 20 March 2002, 17:49: Message edited by: chickenhawk66 ]</small>