Read this post. It shows you everything you need to do a full navigation retrofit. Since navigation is not available in your country, you could install a nav computer still, or just install the Television module instead of a navigation computer. Either nav or TV will drive the screen, and the TV module would simplify the retrofit a little bit and give you a very good new feature.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input