You can do it with NavCoder. Or, you can buy one of the TV in motion modules from eBay or EAS.

It is not a simple wiring change. You can only do it by a programmatic configuration change to the TV module (NavCoder or BMW diagnostics computer) or by blocking the speed signal from the I-Bus signal wire (TV-in-motion module).

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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