IPhone User in need of a GPS/App?

Every year my family and I travel to Mexico to visit our families. Usually we take our 2-3 day trip driving with my father because he knows the whole way by memory. This time my father wants to ride on a plane and he wants me and my boyfriend to drive to Mexico although he could give me a copy of the directions or just talk me through the steps. When it comes to directions I can't do it without a GPS. We're leaving 1 week before my father and siblings get on the plane cause it's only a 4-6 hour plane ride from North Carolina to Morelia MX. I'm looking for a GPS or an app to use on my phone/car that will also let me use it in Mexico. Last year I attempted to use my Maps on my iPhone and it got us to the US border and then I could no longer use Maps in Mexico.

Any ideas?

Google maps is a good app.

Do you have international data plan? If not the cost of data will eat you alive using that phone in Mexico. Get a GPS for the car so it is on the front window mounted, way more safe to use.

I believe that Apple Maps app now covers Mexico, as does the Google Maps app.