POS message and Secondary GPS

@Nihal wrote:

From what I've heard, the POS message contains the most reliable estimate of the vehicle's position which is calculated from GPS and Accelerometer data. The POS data is used in the CAM message whenever the signal is sent to the camera to take a picture.

My question is, does the POS message use just the GPS1 Data? If I use a secondary GPS, Can I make sure that the GPS2 Data is used instead for the POS messages?

Or, How exactly is the POS message calculated? Can I Do the same math later by analysing the logs?

Thanks

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