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4. Accuracy and errors
Helpful tips
Present location display error
In order to find the exact position of the present location, this device uses compiled data from
the GPS satellite, vehicle speed sensor and vibration gyro sensor. Because each of these
contains a margin of error, the present location indicated may not exactly coincide with your
actual positioning.
Tire-related errors
The device calculates the distance traveled by the vehicle using a speed sensor that
measures tire rotation. The following situations will result in a significant error that may render
proper present location positioning impossible.
● Using a substandard tire.
● Driving on a snow-covered, gravel, or other slippery road.
● Incorrect tire air pressure.
● Using new tires (the distance compensation coefficient setting can be changed and
adjusted).
Under the following conditions, make sure to install the GPS antenna in the
position indicated in the instruction manual for your vehicle model.
●If the noise emitted from another electrical device diminishes signal reception.
●If the device may cause an obstruction to the proper operation of airbags.
●If the satellite signal received from the side or rear of the vehicle is diminished
because of a windshield pillar or roof panel.
If the indication is different from your actual position, the present location displayed can be
corrected. Park the vehicle in a safe place first before proceeding.