IPhone GPS that allows uploads?

[NCer]

Hello, all !
I am looking for the iPhone GPS application with voice guidanvce that would allow for an upload of custom maps.
Meaning - You'd create a custom route in Google and then would be able to upload to that iPhone GPS application for routing.

I could not find such an application so far... Maybe some of you did?

Thanks!

 

[ziggie]

That would be.nice.i have.looked before also.

 

[NCer]

I know of one way to do it, but it does not give the voice turn by turn guidence...