→Navigation and Communication: hatnote
[[File:Extra500 audiopanel.png|thumb|400px|Extra500 audiopanel: Com1, Nav1 and Marker selected]]
See [[Extra EA-500/IFD|here]] for a more detailed description of the IFD-s.
The COM unit (1 or 2 ) is selected on the audiopanel. Just hit the appropriate "XMT" button. Note that FGCOM only works on COM1!
Manual mode selection is then possible.
The MODE button on the keypad will set the mode manually also.