HTC P3300 User Manual page 145

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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.
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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.
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Wireless communication products (such as mobile phones or radar-
detecting devices) may interfere with the satellite signal, resulting in
unstable signal reception.
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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.
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When the GPS system is activated, please do not cover the antenna
area with your hand or any other object.
Using GPS 145
GPS antenna