X5 E70 CCC retrofiting help!!!

[alinc]

Hi,
I just retrofited my 2007 X5 with a CCC unit with GPS(I had that M-ASK before).
Everything is working(PDC,telephone,stering wheel controls),except the GPS!
I´ve used an GPS antenna bought for 30 euros,so it is not the original one,which I´ve fixed under the dashbord.
The GPS shows me my position in terms Latitude and Longitude,but when I input an address and start driving,its completly wrong,even the North is not showed right,its shows the North in South.
Some kind of comunication exsist between GPS antenna and the satellite because I can see that the clock is automaticly adjusted.
So I have 2 questions:
1.The GPS antenna must be a BMW antenna
2.If I´ll code the car ,it will resolve this issue?
Sorry for my english!
Regards from Sweden!