You need to update to a newer disc - genuine only if discussed on the Forum. Your firmware also may need updating to get 'Perspective' view. I think that came with V26 from memory (V32 being the last issued for the Mk4 system). Changing to perspective view is under 'Set'' if I remember correctly (not Navigation).
If you press Menu > Set..... what numbers appear at top right of the screen?
If V32 then it will show 4-1/00, if not that is an earlier upgrade. They all start 4- for the Mk4 drive.
The full list of official versions can be found
here...
Updating the system is best done by a Dealer unless you can find the right files and create your own. Plenty of us have done that bit with no issues but if something doesn't quite go right you can brick the Nav computer. Illegal map discs can be unreliable as the MK4 (DVD) computer is sensitive to what discs are fed into it.