What Is A Navigation System - Panasonic Strada CN-NVD905U Operating Instructions Manual

What is a navigation system?

A navigation system marks a route to a destination or
destinations on a map, guiding the user along the route
to the destination.
Vehicle positioning system
 GPS (Global Positioning System)
The positioning system uses communications satellites
launched by the US Department of Defense. Signals are
received from three or more satellites orbiting at 21 000
km altitude, and the principle of triangulation is used to
fi nd the position.
By receiving GPS signals, this system can position the
vehicle within a margin of error of 30 to 200 m.
Time before the current position is found
When this system is used for the fi rst time, or if it
has not been used for an extended period, it may take
as much as 5 minutes to fi nd the current position. In
normal conditions, at a location with good reception,
positioning takes around 2 minutes.
Starting to move the vehicle immediately after turning on
the power causes it to take longer to fi nd the position, so
the user is advised to remain parked in a location with
good reception (with no buildings or trees to block the
signals from GPS satellites) until the current position is
found.
 Locations where GPS signal reception
is diffi cult
Reception may not be possible in locations such as the
following:

In tunnels
 Between tall buildings
 Under elevated roads
 Between trees
 Map matching
This function displays the vehicle position obtained from
GPS, the gyro sensor and other sources on the map.
Actual path
Route trace derived from sensors
Screen display
Point corrected by map matching
Road on the map
data
110
110
Vehicle positioning precision
The vehicle mark position may not be displayed
correctly due to the driving environment and the
GPS satellite status.
Continue driving without taking further action, and the
map matching function and GPS satellite data will be
used to automatically correct the vehicle mark position.
 When a highway and an ordinary road are close
together

When driving through a fork junction with a narrow
angle between roads
 When driving on roads in a block grid pattern
 After moving on a ferry, car transporter, etc.

When driving on steep mountain roads
 When driving on winding roads
 When turning right or left after driving on a straight
road for a long period

When driving in a weaving motion on a wide road
The vehicle mark position may not be displayed correctly
in the following additional situations:

Between turning the ignition switch on (after turning
the power on) and receiving GPS signals.
 When driving for the fi rst time after installing this
system.
 After changing a tire, particularly when driving on an
emergency tire.
 When driving on roads that are slippery due to snow,
gravel etc., or when driving with tire chains.
 When the vehicle emerges onto a normal road after
driving on a spiral route out of an underground or
multi-story parking lot, or when the vehicle was turned
on a turntable after stopping the engine (turning the
power off).
 GPS satellites are under the control of the US
Department of Defense, which may deliberately reduce
positioning precision. In such situations, the vehicle
mark not refl ect the actual position of the vehicle.