Sony HDR-GW77V "Handycam User Manual page 187

"Handycam" User Guide
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Top page > Maintenance and precautions > Maintenance and precautions > About GPS (HDR-GW77V)
About GPS (HDR-GW77V)
The GPS (Global Positioning System) is a system that calculates geographical location from highly
accurate US space satellites. This system allows you to pinpoint your exact location on the earth. The
GPS satellites are located in 6 orbits, approximately 20,000 km above the earth. The GPS system
consists of 24 or more GPS satellites. A GPS receiver receives radio signals from the satellites, and
calculates the current location of the receiver based on the orbital information (almanac data) and travel
time of the signals, etc.
Determining a location is called "triangulating." A GPS receiver can determine the location's latitude and
longitude by receiving signals from 3 or more satellites.
As the positions of GPS satellites vary constantly, it may take longer to determine the location or the
receiver may not be able to determine the location at all, depending on the location and time you use
the camcorder.
"GPS" is a system for determining geographic location by triangulating radio signals from GPS
satellites. Avoid using the camcorder in places where radio signals are blocked or reflected, such as
a shadowy place surrounded by buildings or trees, etc. Use the camcorder in open sky environments.
You may not be able to record location information at locations or in situations where radio signals
from the GPS satellites do not reach the camcorder as follows.
In tunnels, indoors or under the shade of buildings.
Between tall buildings or at narrow streets surrounded by buildings.
In underground locations, locations surrounded by dense trees, under an elevated bridge, or in
locations where magnetic fields are generated, such as near high voltage cables.
Near devices that generate radio signals of the same frequency band as the camcorder: near 1.5
GHz band mobile telephones, etc.
On triangulating errors
Error caused by the position of GPS satellites
The camcorder automatically triangulates your current location when the camcorder receives radio
signals from 3 or more GPS satellites. The triangulating error allowed by the GPS satellites is about
10 m (33 feet). Depending on the environment of the location, the triangulating error can be greater.
In this case, your actual location may not match the location on the map based on the GPS
information. Meanwhile, the GPS satellites are controlled by the United States Department of
Defense, and the degree of accuracy may be changed intentionally.
Error during the triangulating process
The camcorder acquires location information periodically during triangulating. There is a slight time
difference between when the location information is acquired and when the location information is
recorded on an image, therefore, the actual recording location may not match exactly the location on
the map based on the GPS information.
On the restriction of use of GPS
Use GPS in accordance with the regulations of the situation, the countries/regions of use.
On the map data
The camcorder contains map data for the following countries/regions. Europe, Japan, North America,
Oceania, etc.
Built-in map is powered by companies as follows; Map of Japan by Zenrin Co., Ltd., other areas by
NAVTEQ.
The map data included is as of the date of production of this manual.
GPS maps will appear in 2-dimensional graphics except for certain landmarks in Japan, which will
appear in 3D.
The map always displays the north at the top.
You cannot change the language on the map.
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