It is probably a typo. The "DVD Navigation" that section refers to is what we generally call the MKIV. The SW version it mentions is "5-1/60" however, there is no mention anywhere of the "4-1/60" version that we all see on our MKIV systems.

Now that I think about it, I do not know where the name "MKIV" actually came from. I would not be surprised if that is a term that enthusiasts coined, and BMW uses different language to describe the systems.

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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