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Accuracy and Error
What to Do When...
Since this receiver uses information from the GPS satellite signals to establish the present
location, and the measurements from each of these include some error, the displayed present
location may not match your actual position.
CHECK
When the displayed present location does not match your actual position, you can revise it. Stop
somewhere safe, before revising.
Map matching refers to a system of comparting present location information obtained using
GPS and the like with the roads which you have travelled on so far and correcting your present
location so that you are on the most appropriate road.
This receiver uses road shapes to correct the present location information that has been
obtained by combining independent measurements and satellite measurements.
However, since some error in the present location is unavoidable, the present location will
sometimes differ from your actual position even after correction by map matching.
The vehicle mark may also leave the road you are driving on when it differs in form to the map
data.
ATTENTION
Since this receiver does not operate in a stable manner when first switched on, the vehicle mark
may differ from your actual position when you start moving. After a short while, operation stabilizes
and normal operation will ensue.
As shown in the following, under certain road and driving conditions, accurate present location
and route guidance may not be available. This does not mean that your device is faulty.
About Errors in Present Location Display
About Correction of Vehicle Position Detection by Map
Matching
About Accuracy of Present Position Display and Route
Guidance
Actual path taken
Path taken as per sensor data
Screen display, correction by map matching
