v22 is probably the latest OS for MKIII Nav's. You can try to load newer OS's but your settings will continue to read 3-1/63. I successfully installed v23 on an MKIII and ran it for months without any problems. Here's a link to where you can download it:
http://www.xoutpost.com/articles/all-...ng-system.html

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In the garage
2008 Infiniti G37S Coupe (Traded)
2011 BMW X5 xDrive35i
2011 BMW X5 xDrive50i