Using Core PRO/ TBS Blackbox with NAZA:
The standard NAZA GPS calibration is sufficient ie the DJI party dance.
Using Core PRO/ TBS Blackbox with the TBS GPS and NAZA:
If you are running a TBS GPS then it is mandatory to calibrate it once through the OSD menu.
This does not need to be repeated every time you change the location as the compass and the OSD both learn compass values over time.
The NAZA GPS should still be calibrated everytime you cross a time zone.