Gps (dsc-hx5v only), On triangulating errors, On the restriction of use of gps on an airplane – Sony DSC-HX5V User Manual
Page 155: On the other restriction, On the geographic coordinate system
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GPS (DSC-HX5V only)
This system allows you to pinpoint your exact location on the earth. The GPS satellites are
located in 6 orbits, 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
camera.
• “GPS” is a system for determining geographic location by triangulating radio signals from GPS satellites.
Avoid using the camera in places where radio signals are blocked or reflected, such as a shadowy place
surrounded by buildings or trees, etc. Use the camera 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 camera 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 camera: near 1.5 GHz band
mobile telephones, etc.
On triangulating errors
• If you move to another location right after turning on the camera, it may take a longer time for the camera
to start trianguating, compared to when you stay in the same place.
• If triangulating fails, previously-triangulated location information may be written onto the image in the
camera.
• Error caused by the position of GPS satellites
The camera automatically triangulates your current location when the camera receives radio signals from
3 or more GPS satellites. The triangulating error allowed by the GPS satellites is about 30 m (98 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 camera acquires location information every about 15 seconds 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 on an airplane
• During take off and landing of an airplane, turn off the camera, as you will be instructed to do by the on-
board announcement.
On the other restriction
• Use GPS in accordance with the regulations of the place or situation.
On the geographic coordinate system
• The “WGS-84” geographic coordinate system is used.