You are correct. Move the thin coax cable over to the MKIV. Just disconnect the black plug and leave that hanging. You do not need it any more.

Trimble is the name of the company that manufactures the GPS receivers.

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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