There is no export to KML/KMZ format right out of the box. You can export to ESRI SHP format then use many of the paid and/or free apps to export to KMZ. Do a google search and you should find a few apps.
Hi,
if you are under subscription, you can install MAP 3D 2012 + GoogleEarth Plugin which add a nice wizard to export AutoCAD Objects (2D and 3D) to KML or KMZ
Olivier
This works from Civil 3D but not from Map 3d:
In "Toolspace", go to the "Toolbox" tab, expand "Miscellaneous Utilities", expand "Export KML", right-click "Export KML" and click "Execute..." .
You can try our advanced Export KML plugin from Autodesk apps store.
https://apps.autodesk.com/CIV3D/en/Detail/Index?id=6995279902965544097&appLang=en&os=Win32_64
Albert
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