Sony GPS-CS1KASP Manuel d'utilisation
The positions of GPS satellites vary. Depending on the location and
time you use a GPS receiver, it may take longer for tracking or the
receiver may not track the location at all.
“GPS” is the system tracking location by receiving radio signals from
GPS satellites. Avoid using the unit in the places where radio signals are
blocked or reflected, such as a shadowy place surrounded by buildings
or trees, etc. Use the unit in open sky environments.
You may not record a GPS log at the locations or in the situations where
the radio signals from the GPS satellites do not reach to the unit as
In tunnels, indoors or under shades of buildings.
Between tall buildings or at narrow streets surrounded by buildings.
At underground locations, surrounded by dense trees, under an
elevated bridge or at the locations where magnetic fields are generated
such as near high voltage cables.
Near the devices that generate the radio signals of the same frequency
band as the unit: near the 1.5 GHz band mobile telephones, etc.
The unit may not track when you are moving at the speed of about 500
km/hour (300 miles/hour) or faster.