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134  Navigating on the Road

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.

Before you start using your phone for GPS navigation, open the QuickGPS program 

first to download ephemeris data (current satellite position and timing information) 

onto your phone. This data is needed to determine the GPS position of your current 

location.
QuickGPS downloads ephemeris data from a web server, instead of from the 

satellites, using the Internet connection on your phone, which can be via Wi-Fi, 

ActiveSync or GPRS/3G. This significantly speeds up the time for determining your 

GPS position.

Click Start > Accessories > QuickGPS.

Click Download on the QuickGPS screen.
On the screen, initially, you will see the Valid 

time of the downloaded data. As time passes, the 

remaining days and hours of validity will be shown.
To speed up GPS positioning, download the latest 

ephemeris data when the validity of the data 

expires.