Hello, I use TomTom Go Android App for its accurate route suggestions and correct road maps. But I need to tell you that the POIs are pretty bad though. I would suggest you to work with some Turkish companies to work on Turkish maps. "Başarsoft" and "Harita Genel Müdürlüğü" are pretty good at POI accuracy and Address accuracy, but I don't trust their navigation apps. Thank you for reading.