We recently bought a 2008 Cayenne S here in the United Arab Emirates. The car has a radio with navigation system built in it. It is a Bose stereo system. The maps have not been updated since it was new. Porsche hasn't updated the navigation disk for the Middle East since 2013. The newest disc is $400 in the US and $765 here in the UAE.

What is a good replacement radio to put in the car that has GPS and bluetooth that will work with the steering wheel controls and the Bose system?

Any help would be greatly appreciated.

Thanks in advance.