Have already got the answer. If you have the V27 or V28 BMW firmware for the satnav, you already have the option of a 3d-view on your screen. The point is, you have to activate it. Go to "menu", enter "set" (settings) and in this view press the menu button and hold for 10 secs. Another (hidden) menu appears, there is the "perspective". You have to enter it and activate. After leaving this submenu and going back to the navi view when you choose the "map" and "view options", there you have three, not two anymore!