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Navigating on the Road 185
• The GPS signal cannot pass through solid non-transparent objects. 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.
• Wireless communication products (such as mobile phones or radar-detecting
devices) may interfere with the satellite signal, resulting in unstable signal
reception.
• 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.