You can do any of this:
- download the offline maps - you can use the application: settings->offline data->download (filter your data and download)
- download the offline maps in computer from
osmand.googlecode.com and copy them to your sd-card
- download osm files and use the OsmAndMapCreator to create obf file sutable for OsmAnd to display and copy it to sd-card
And of course, you should select the verctor map layer than in map view.
Look in how-tos.
Regards,
Pavol