Mazda 3 Owner's Manual page 306

When Driving
Rear View Monitor
NOTE
Because there may be a difference between the displayed image, such as indicated below,
and the actual conditions when parking, always verify the safety at the rear of the vehicle
and the surrounding area directly with your eyes.
In the image of the parking space (or garage) displayed below, even though the back
end and distance guide lines appear parallel in the monitor, they may not actually be
parallel on the ground.
When parking in a space with a division line on only one side of the parking space, the
division line and the vehicle width guide line may appear parallel on the monitor, but
they may not actually be parallel on the ground.
Variance Between Actual Road Conditions and Displayed Image
Some variance occurs between the actual road and the displayed road. Such variance in
distance perspective could lead to an accident. Note the following conditions that may cause
a variance in distance perspective.
When the vehicle is tilted due to the weight of passengers and load
When the vehicle rear is lowered, the object displayed on the screen appears farther than the
actual distance.
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Object
Variance