The E65 does use a totally different nav computer. The MKIV doubled the CPU speed over the MKIII. I'll bet that the E65 nav computer is at least twice as fast as the MKIV. Therefore, they are probably using that extra speed to render street names in perspective mode.

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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