What Is A Navigation System - Sanyo NV-E7000 Installation And Operation Manual

ABOUT DISCS (2)
HOW TO HANDLE DISCS
¡Try not to touch the recorded surface of discs
when holding them.
¡Adhere paper or seals to the printed or
recorded surface of the disc in a way so as not
to scratch the disc.
¡Do not use discs with dried glue from peeled
off cellophane tape or labels. The discs may
not be retractable resulting in damage to the
unit.
¡The discs are rotated at a high speed. Do not
use cracked or warped discs.
¡To prevent warping, store in a case away from
direct sunlight. Do not place them on the seat
or dashboard in vehicles under direct sunlight
especially during the summer months when
temperatures rise significantly.
¡Prior to use, gently wipe away any dirt, dust or
fingerprints from the recorded surface of the
disc using a soft cloth from the center of the
disc towards the edges.
¡Do not use a record spray or an antistatic
agent. Also, discs may get damaged by
benzene, thinner or other volatile substance.
Do not use these.
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Printed surface
Thinner Benzene
Record
cleaner

WHAT IS A NAVIGATION SYSTEM (1)

ABOUT THE GPS (GLOBAL POSITIONING SYSTEM)
What is GPS
"GPS" is a global positioning system developed by the
United States Department of Defense whereby 3
electromagnetic signals are simultaneously received
from NAVSTAR (GPS satellite), hovering at 13,000
miles above the earth. The principle by which this
system locates the present location of your vehicle
entails triangular measurement based on the distance
between the satellite and your vehicle as well as the
orbit of the satellite.
Hint
Because signals from the GPS satellite are controlled by TACC (Tracking and Control
Center), accuracy may be diminished or signals may be stopped intentionally.
Positioning accuracy
The accuracy of the present positioning can be determined by the color of the "GPS reception
display" mark located on the upper right corner of the present location display screen.
GPS reception display
Hint
¡Because positioning may take time even as signals are being received from the
GPS satellite, for roughly 3 to 4 minutes after having turned the unit ON, the
precision display will not be effectuated and the GPS reception display color will
remain gray.
¡When the unit receives signals usable for positioning from the GPS satellite, the
present location is displayed on a map. However, because there is a margin of error
of about 100 to 650 feet, the actual position and the location appearing on the map
may not always correspond. Also, because the GPS satellite is controlled by the
U.S. Department of Defense, data from measurement signals may be intentionally
modified. In such cases, the present location display error will be significant. To
correct this discrepancy, the unit is equipped with a map matching function*.
*: Because there may be instances when positioning errors made by the GPS satellite
occur, the unit may determine the present location in an area other than on a road
(ex.: in a river). During such instances, this function makes the unit think that "a
vehicle is a thing that runs on a road" and corrects the present location to the
nearest road.".
Electromagnetic waves
GPS exterior
antenna
(Yellow): The present location is determined.
(Gray): The present location is not
determined or is in the process of
being determined.
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