How does StreetView determine which direction is north?

I have a series of panoramas with links between them.  These panoramas have 
GPS coordinates associated with them and I use them to calculate the 
compass bearings between two links.

However, it seems that the links themselves are being rendered in arbitrary 
directions regardless of the heading value.

In my panorama options, I've set the default heading to 0.  If this is 
combined with a panorama heading of 0, the view is rendered from the center 
of the panorama.  Unfortunately, as my link bearings are based off GPS 
coordinates, if there is no constant north value, the links get rendered 
all over the place.

How would I solve this?

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