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Why do you believe that the Nav equipped Gs screens are half an inch bigger?
Well, the reason I said that is because I know that the Ms navigation display is 1 inch larger than the base display (8' compared to 7'). On the G the screen may actually be the same size. Not 100% sure!
The screen comes with all trims. But I believe the Nav. screen is about 0.5 inch larger in diameter than the one on models without the Nav. package.
As far as I'm concerned the screen is not round, and the term "diameter" stands for twice the length of the radius of a circle. Did you mean the diagonal of the screen is about 0.5" larger? Or is it 0.5" larger in wodth or height?