Справочник Пользователя для Sprint Nextel 595U

To acquire a location fix, you must be connected to the Sprint network, (subject to 
change) not roaming, and, for the initial fix, in 1X coverage.

If you're outside with a clear view of the sky, the USB modem uses MS-Based 
position location technology. Weather conditions may affect your ability to get a 
clear view of the satellites and thus to acquire a GPS fix. MS-Based GPS (Basic) is 
for outdoor use only.

GPS on a Sprint data card works like any other GPS device. Sprint provides two 
types of GPS mode: GPS Basic, and GPS Premium.

For more information, see “What is GPS Basic?” and “What is GPS Premium?” on 
page 89.

Sprint GPS Basic supports GPS outdoors. Your USB modem requires an 
unobstructed view of GPS satellites (in the sky), and, like any other GPS device, 
might not perform well within forested areas or near tall buildings. 

Sprint GPS Basic is based on GPSOne™ standards and uses Location-Based Services 
for the first, fast, GPS fix. GPS coordinate values are made available to applications 
via a local GPS NMEA Com port.

Location-Based Services use Advanced Forward Link Trilateration (AFLT). AFLT is a type 
of device-based position location technology. Unlike A-GPS, AFLT does not use GPS 
satellites to determine location. Instead, the device takes measurements of signals 
from nearby cellular base stations (towers) and reports the time/distance readings 
back to the network; the readings are then used to triangulate an approximate 
location of the device. In general, at least three surrounding base stations are 
required to get an optimal position fix.
AFLT accuracy may vary, depending on the geometry of the cell towers in your 
location.

Sprint Location Services may not be supported if 

 is set to 

 

or (subject to change) if you are roaming. To use Sprint Location Services, ensure 

 is set to 

 or 

, and ensure that you are in the network 

coverage area (not roaming).