You may want to upgrade to a double din head unit that supports Android Auto and Apple Carplay. Much better than factory Nav. Plus, you'll get a nice new modern head unit with BT phone & audio, Sat radio, etc.
That's where I'd put my money (and I recently did).
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2004 Boxster S, 6 spd, Triple Black
1986 944 Turbo (sold in 1988)
Since then, a 300ZX, a few BMW 3 Series, a few VW's
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