Did you pass any electrical generating plants on 175 during the trip? Or anything that may disrupt the system. Microwave antennas? anything like that might disrupt the GPS and send a false reading. Maybe someone else in your area had the same issue the same day.  It's just a guess. Or maybe you have been abducted by aliens for a bit.  Check the back of your neck for implants. 
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Originally Posted by Video Chef
I was driving down I75 in Florida the other day in my '02 X5 3.0 with Mark III Navigation and all of a sudden the voice came on and said navigation not possible or something to that effect. I looked down and the guidance was off and take a look at my altitude. It started counting up for 30 minutes or so then started decrementing til it got to about 5000 feet or so. I recycled teh iginition and it hasn't happened since. Perhaps I need to get oxygen masks and flotation devices installed. Any ideas?
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