Offline maps on a Eonon car dvd player

HI,

I have recently purchase a 2din android car audio unit to replace my broken one.

I use to have the built in gps/maps (offline) on my old unit, Does anyone know if and where i can download offline tomto maps to work on my unit?

I have pirchased the following unit

Eonon 2din android dvd player

http://www.eonon.co.uk/Android-Car-GPS/GA5161F.html

Thanks