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Further Information
Other
● At times, satellites under the control of the US Department of Defence will intentionally drop
positioning accuracy.
■ Regarding Errors in Current Position Display
To pinpoint the current position, the unit uses information from GPS satellite electromagnetic
waves. If any of these contain errors, the current position may not match the actual position.
■ Regarding Vehicle Position Detection Correction Using Map Matching
Map matching is a method of comparing information on the current position acquired by GPS
and so on, with the road driven up to that point, and correcting the current position based on the
most likely road.
This unit uses information on the current position combined with independent navigation and
satellite navigation and matches it to the shape of the road to create the correction.
However, as it cannot avoid the error margins at the current position, the current position may
shift away from the actual position even when correcting using map matching.
Also, the vehicle marker may shift if the map data and the shape of the road being driven on
differ.
Because it takes a short time for operations to stabilise just after turning on the unit, the vehicle
mark may not immediately match the vehicle as it moves. After driving for a while, operations
stabilise, and the marker should match the actual driving position.
Actual Vehicle Swept Path
Vehicle swept path acquired from each sensor
Corrected using map matching on the screen
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