HTC P3300 Mode D'Emploi

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Using GPS  145
  Signal reception may be affected by obstructions such as high-rise 
buildings, tunnels, bridges, forests, weather (rainy or cloudy days), 
etc. If the vehicle’s visor contains metal, it will be difficult for the GPS 
signal to pass through. To have better signal reception, try connecting 
your device to an external GPS antenna.
  The Global Positioning System (GPS) is built and operated by the US 
Defense Department. The Department is responsible for the accuracy 
and maintenance of the system. Any changes that the Department 
makes may affect the accuracy and function of the GPS system.
  Wireless communication products (such as mobile phones or radar-
detecting devices) may interfere with the satellite signal, resulting in 
unstable signal reception.
  Please do not leave your Pocket PC in the vehicle and expose to direct 
sunlight to avoid overheating the battery that could pose damage to 
the device or risk to the vehicle.
  When the GPS system is activated, please do not cover the antenna 
area with your hand or any other object.
 
GPS antenna