Pontiac Vibe Navigation System Supplement ユーザーズマニュアル

At times, the position of the vehicle on the map may be
inaccurate due to one or more of the following reasons:
D The road system has changed.
D The vehicle is traveling on slippery road surfaces

such as sand, gravel and/or snow.

D The vehicle is being driven on winding roads.
D The vehicle is being driven on a long straight road.
D The vehicle is approaching a tall building or a 

large vehicle.

D The surface streets run parallel to a freeway.
D The vehicle has just been transferred by a vehicle

carrier or a ferry.

D The current position calibration is set incorrectly.
D The vehicle is being driven at high speeds.

D The vehicle is repeating a change of directions by

going forward and backward, or turning on a turn
table in a parking lot.

D The vehicle is entering and/or exiting a parking lot,

garage or a lot with a roof.

D The vehicle has a roof carrier, ski or bike rack

installed on it.

D The vehicle has tire chains on it.
D The tires have been replaced.
D The tire pressure is incorrect.
D The tires are worn.
D The battery is disconnected.
D The vehicle is driven in heavy traffic where driving

is at low speeds and the vehicle is stopped and
started repeatedly.