4 Communication
Access: The GPS Intermediate Driver allows multiple applications to access the GPS receiver. To
manage the GPS Intermediate Driver, uncheck the check box.
Hardware: COM2 is the hardware port dedicated for the built-in GPS. Verify that COM2 is selected.
The internal GPS communicates at 9600 baud by default. If it has been modified by a third-party
program, adjust to match the receiver baud rate.
Programs: Programs that use GPS need to know which port to use to access GPS data. When using
more than one GPS-aware application, the same GPS program port must be used in each
application. Ensure that the COM port on the GPS-aware application(s) is set to the same GPS
program port as shown in the Programs tab of the GPS applet. The program port must be a
different port than the hardware port. By default, this is COM3.
Note – Some GPS-aware applications may not communicate over GPS ports.
A-GPS: While Assisted GPS can improve time-to-first-fix, it may reduce accuracy in some situations.
Uncheck the box next to Enable Assisted GPS and reboot your unit if you wish to disable it.
Using Assisted GPS (A-GPS)
Assisted GPS is not supported on models with a SiRFStar IV GPS chip (identified by brick codes
starting 9xxxx; the brick code for your unit can be identified on the bottom left of the unit's label,
visible when the battery is removed.)
To enable and disable A-GPS, tap / Settings / System / GPS / A-GPS.
If the GPS has been used in the prior 72 hours, A-GPS will retain a memory of the satellite paths. The
A-GPS satellite data is stored in memory for the satellites visible in your current position. Therefore
the unit can lock on the satellites quickly, in less than 20 seconds in an open sky. The expiration of
the A-GPS data is also shown in this menu. Using A-GPS may reduce accuracy in some situations.
If you are unable to connect to the GPS using the default GPS settings, you can restore it to factory
default settings by performing a system shutdown and leaving the unit shut down for
approximately 5 minutes. See Power key features on page 13.
SatViewer
(Optional on certain device offerings; may not be installed.)
If your unit has the built-in GPS, it may have SatViewer installed. External GPS receivers, Bluetooth
GPS receivers or other external GPS devices (including other SiRF II , SiRF III, or SiRF IV GPS receivers)
are not supported and may not work correctly with SatViewer. See Appendix A for more instructions
on using SatViewer.
Exiting GPS applications
Any time you exit a GPS application (such as SatViewer) it is advisable to close the port gracefully, for
example, tap Disconnect from GPS and exit the application. Failure to do so may leave the port
open and hinder the next GPS operation.
Ranger Series Handheld Computer 49
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