1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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Navigation requires new COMAND unit, there are multiple COMAND units that come with or without navigation.
So if you don't have nav, you need to replace the entire unit with one that has navigation.
So if you don't have nav, you need to replace the entire unit with one that has navigation.