2007~2015 CX-9 Reset Navigation System?

[Virgil2U]

I just purchased a 2011 Mazda CX-9 and while attempting to learn the new infotainment system on it, I unknowingly did something to the navigation system and now the screen is stuck on "Insert Map DVD". Does anyone know how to correct this? The navigation system was working perfectly before this. But now I am not able to access it for any travel directions or anything else.