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Upgrading Radio/Nav to Mk IV & BM54

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I have a 2001 E39 M5 with BM24 radio and Mk III Sat Nav.

I was looking to upgrade the Sat Nav to the DVD based Mk IV.

Is this a straight swap and does it require an upgrade of the BM24 to BM54 and anything else?

Anyone done this ? Was it worth it??

Many thanks.

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Check out, it should answer your questions.

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