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In the event of obstructions blocking GPS satellite signals from reaching the GPS
exterior antenna, the signals will be difficult to receive rendering the measurement
of the present location impossible. Conditions for proper present location
measurement include driving in areas where there are no obstructions blocking
signal reception.
Areas such as the following are not suitable for GPS satellite signal reception, move
away from them for proper positioning.
¡In a tunnel ¡Surrounded by tall
buildings
¡Under an elevated
highway
Tunnel
¡Within a building
* The following are reasons why the GPS satellite reception frequency fluctuates even at the same
location.
¡Because the position of the GPS satellite changes with time due to its orbit around the earth.
¡Because signal reception may be affected by other signals whose frequencies are close to those
transmitted by the GPS satellite.
RECEIVING SIGNALS FROM THE GPS SATELLITE
¡When riding on public transportation
If the unit does not receive signals from the GPS satellite using the GPS exterior
antenna included with the unit, present location measurement will be impossible.
To display the actual present location, connect the GPS exterior antenna to the unit
and proceed with the reception of signals from the GPS satellite.
Proceed with GPS satellite signal reception as shown below. When the unit receives
signals it can use to measure the present location, the GPS reception display ( )
located in the top right corner of the present location display screen lights up yellow
and the actual present location is displayed.
* When the GPS reception display ( ) is gray, the present location measured previously is displayed.
After having purchased the unit, the San Francisco area will be shown if the unit hasn’t had a chance
to measure the present location yet. GPS signal reception is impossible from inside a building.
To measure the present location properly, take the GPS exterior antenna outside and proceed with
signal reception.
Connect the included GPS exterior antenna
to the unit.
Mount it horizontally on the exterior chassis
of the vehicle or in your vehicle (dashboard)
on a flat surface where any part of your vehicle
will not obstruct signal reception.
* – Signals may not be properly received if installing within the vehicle. Try your best to install it on the
exterior of your vehicle. (The included GPS antenna mounting plate is required if installing within
your vehicle.)
– If installing within your vehicle, we recommend your separate the unit and the GPS exterior antenna
by at least 10 inches so as to prevent them from interfering.
INSTALLATION EXAMPLE
Connect the included GPS exterior antenna to
the unit and place it outside in an area where
signals will not be obstructed.
* Within buildings or public transportation, the roof may
obstruct the proper reception of GPS satellite signals
rendering the measurement of the present location
impossible.
* To prevent interference between the navigation unit and
the GPS exterior antenna, we recommend that you install
them at least 10 inches apart.
183 184
PRESENT LOCATION MEASUREMENT
IF USING THE UNIT INSTALLED
ELSEWHERE THAN YOUR VEHICLE
IF USING THE UNIT INSTALLED
IN YOUR VEHICLE
AREAS WHERE PRESENT LOCATION MEASUREMENT IS IMPOSSIBLE
¡Within a dense cluster
of trees
Make sure to conduct signal reception in a wide open area.
When the unit receives signals it can use to measure the present location, the GPS
reception display ( ) located in the top right corner of the present location display screen
lights up yellow and the actual present location is displayed.
After having purchased the unit and using it for the first time or using it again after
an extended period of inactivity, it may take the unit 15 to 20 minutes before being
able to display the actual present location. (This is because the satellite tracking data is
sent by the GPS satellite once every 12.5 minutes significantly delaying the time it takes for
data to be received. Do not move your position until the present location is
displayed.) Normally, the position screen should appear a few minutes after having turned
the power ON.
THE TIME IT TAKES FOR PROPER SIGNAL RECEPTION
GPS exterior antenna
GPS exterior antenna
INSTALLATION
EXAMPLE
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