T-Mobile dash 3g ユーザーズマニュアル

150  Navigating on the Road

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.
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 using the phone for GPS navigation, open QuickGPS to download ephemeris 

data (current satellite position and timing information). QuickGPS significantly 

speeds up the time for determining your GPS position. QuickGPS downloads 

ephemeris data from web servers, instead of from satellites, using your phone’s 

Internet connection via Wi-Fi, ActiveSync or 3G/GPRS/EDGE.

Select Start > QuickGPS.

 Select 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.