Nothing to add about NAV but I'll weigh in on the top question.
Assuming you're mot having trouble latching your top, it is normal to have the top stop shy of the header and then be pulled slightly into the header manually as you latch the top.
I've had 4 Boxsters and all of them acted the same.
That being said, it is possible to adjust things to make the top come a little closer. I've not had to do the adjustment but I've seen mention of procedure.
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