Pioneer AVIC-Z830DAB Operation Manual page 158

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.
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