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brilliant You Tube instruction, thanks. All the other aspects of the knob controls work just fine it is only the scaling of maps that does not alter, so not sure if it is a broken shaft.

I can get the scale menu up at ".1 to the mile" on full screen mode, but when you turn the knob on the centre console it does not change the scale, smaller or larger. It worked fine up until a couple of months ago, we have not upgraded or anything we can think of in terms of changes. We do have...

C class estate 08 plate we are unable to change the scale on any map,we have followed all the instructions, but rotating the control knob does nothing. If we upgrade do you think it will correct the issue. many thanks