hi allflight57,
the reason there is no 'HDG' info is because the ND is selected to MAP which will give TRK info and as it was probably the end of the flight, thus no route info in the FMC i.e. no TRK info on ND. this is the normal confiq when the acft comes to the parking gate. if you switch to VOR iso MAP, then you WILL see the HDG info.
the b777 PFD works the same with other boeings. the photo you posted, the ADIRU was aligned!
hope this helps...
SR
ps: perhaps i will take a photo of the flight instruments WITH the ADIRU OFF on my next flight and post it here.