Offline GPS map of Texas

[Zbigniew Derlicki]

Hello World,

I'm going to visit Texas soon and I need to have offline maps with GPS navigation and route finding.
I'm from Europe, so if I turn internet transfer on my mobile, I will pay about 3000 USD for internet in roaming

So I'm just looking for a maps for android (Sony Xperia Neo V) that works offline and can co-operate with GPS. Ideally something like Google Maps, but this app should download (through WiFi) and store selected maps in details. It does not have to be for free unless it costs more than 10 USD.

Thanks in advance.
Cheers