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I've never heard of this front v rear tire thing, maybe yours has different sized tires and it makes a difference?? Oh well I won't dwell on that too much, and besides as I mentioned, the tire input is used when the sky is blocked (tunnels, parking ramps etc). When the satellites are being picked up you should have a very accurate position based on GPS just like any other GPS receiver. If the screen definitely shows you are picking up multiple sattelites (at least 3 for triangulation) you should be accurate within at least 50 feet or so, usually alot better than that. I'd say if this is the case (you are receiving sat's) that the new COMAND unit is defective, it wouldn't be the first bad new one I've seen!
Gilly
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