The August issue of the Annual 2014 contains resources and an extensive tutorial for importing real-world vector data from the Natural Earth public domain repository into CC3 overland maps.
The included mapping guide takes you through the process of downloading, prepraring, converting and importing the data for use in CC3. It also goes into detail on how to apply different drawing styles to the imported maps and how continue working after the initial import.
The tutorial pack Real-world Vector Data includes