?'s about Soundstream VR-732 Single DIN DVD/CD/MP3 Player w/ Detachable 7" LCD Screen
 

Does anyone have any experience with the Soundstream VR-732 Single DIN DVD/CD/MP3 Player w/ Detachable 7" LCD Screen?

Does this unit have any accessible navigation controls built into it?

Is it possible for an add-on navigation system to be added to this unit(will it communicate with each other)?

Thank You in advance for your comments and knowledge!