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Frank,

> If it's just an offset in the choice of prime meridian, then all longitudes 
would be offset by the same amount, right? 

Wrong:-) 

I perfectly understand that GPS uses an advanced model for the shape of the 
earth, which is not spherical, not an ellipsoid,
but something more complicated (it is called geoid).

So one cannot have all longutudes agree with those based on spherical or elipsoidal Earth.

But the choice of the Prime meridian is still arbitrary, no matter wat model you use.

My point was that the article poorly explains the matter.
Nothing else.

Alex.

   

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