You have a NAVI01 nav computer. You can upgrade to a NAVI02 or NAVI03. Both of those are DVD-based. The NAVI02 is cheaper and easier to locate. A NAVI03 is a little more expensive and may take longer to find, but worth it for the speed and improved UI. Here is a quick post that compares them.

NAVI01, NAVI02, and NAVI03 key differences

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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