Pioneer AVIC-F980DAB Operation Manual page 77

Appendix
 If you drive in zigzags.

If the road has a series of hairpin bends.
 If there is a loop or similar road configuration.
 If you take a ferry.
 If you are driving on a long, straight road or a gently curving
road.

If you are on a steep mountain road with many height
changes.
 If you enter or exit a multi-storey car park or similar structure
using a spiral ramp.
 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.
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