From the help:
"The room channel allows players to broadcast to anyone in the room. When in flight, everyone who takes off from the same field is in the room. When not in flight, the rooms are the Map room and Tower."
Is this right? I thought that channel 3 was broadcast to countrymen in your general area (roughly a sector). So if two countrymen take off from different fields, but end up over a third, they can't hear each other on channel 3? If this is true then I have been using it and telling everyone else how to use it wrong.