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"um, I think you will find that commercial GPS systems are just not that accurate, especially when there is interference from builidngs, etc"
That's probably the response I'll get from BMW service but after 30 years in the space industry I'm happy to go through the workings to show that 10 meters is the usual worst case accuracy of commercial GPS receivers. This also happens in open country rather than urban canyons where not much sky is available.
If that fails it's a simple job to pop a TomTom in the car and ask BMW to justify the difference in co-ordinates (which should be the 1.5m between the recovers rather than 40m).
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