In our airline, (Talking about the 757 here but I think it is the same), Captain selects Left Instrument source. The F/O has Right AInstrument Source. Consequently we use the centre autopilot all the time. This still leaves the Captain's altimeter as the controlling baro. It also means that both flight directors are in view. On the 757 when the left or right autopilot is selected, the corresponding flight director disappears.
The IRUs provide ATTITUDE, ACCELERATION, GROUND SPEED, TRACK, TRUE AND MAGNETIC HEADING, LAT AND LONG AND WINDSPEED AND DIRECTION.
Eff Oh.
