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It likely has something called 'Dead Reckoning' that a lot of the higher end standalone units have. It probably is hooked to the speedometer so that during brief 'outages' the unit will keep on truckin'.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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