Pioneer AVIC-Z830DAB Operation Manual page 159

If your vehicle is turned on a turntable
or similar structure.
If your vehicle's wheels spin, such as on
a rough track or in snow.
If you put on chains, or change your
tyres for ones with a different size.
If trees or other obstacles block the
GPS signals for a considerable period.
If you drive very slowly, or in a start-
and-stop manner, as in a traffic jam.
If you join the road after driving
around a large car park.
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