To display the Map menu follow these steps:
Type CUI at the command line and press Enter to open the Customize User Interface dialog box. On the Customize tab under the Customizations in All Files panel scroll down to and expand Partial Customization Files. Right click on Partial Customization files and select Load Partial Customization file.
Browse to the following file (Windows 7): C:\Users\USERNAME\AppData\Roaming\Autodesk\C3D 2013\enu\Support\MapClassic.cuix. Select Open. Click Apply and OK.
Finally to display the drop down menus in Civil 3D type MENUBAR at the command line and set the value to '1'. The Map menu should now be added to the list of menus at the top of your screen.
So for example I was using a lot of aerial photography in a recent project. Each image tile had a world file associated with it to enable it to be georeferenced to the correct location. To import the imagery and georeference the images using the info. in the world files you need to import using the Map image insert command rather than the normal AutoCAD image attach. This can be found easily on the Map drop down menu... nice and easy to access..
Using the Map drop down menu along with the map workspace (MAPWSPACE) gives you (easy) access to most of the Map 3D commands in Civil 3D.