Globalsat Technology BT-338 - Manual (Page 11)

PAGE 10 OF 13
BT338_GPS_v2.0
BT-338 GPS
How accurate is the GPS?
The Gloablsat GPS is WAAS/EGNOS capable, and for units sold in North America through authorized
resellers, these units are WAAS/EGNOS enabled unless otherwise stated. Accuracy can be up to 5
meters 2D RMS with WAAS enabled and 10-15 meters 2D RMS WAAS disabled
What is ideal GPS environment?
The GPS requires an open, clear view of the sky. Buildings, covered parking areas, tunnels and dense
foliage can cause the GPS receiver to be unable to get a location fix.
If you are parked in a covered parking lot or near a tall building, it is recommended that you drive away
until you have a clear view of the sky before using the GPS receiver. You may need to give the GPS a
few minutes to find or get a fix its location.
How do I know if the GPS is ON?
If your PC is on and the COM port was configured properly, the GPS receiver is on and receiving the
streaming GPS data. This can be verified by opening your mapping software program. In addition, the
Globalsat GPS has a built-in LED status indicator that shows the following:
LED OFF: GPS receiver is off (no power).
LED ON (solid): No fix, searching for GPS signals.
LED FLASHING: Position fix established and GPS signals are being received.
Why does the GPS not work near buildings and other tall objects?
The GPS uses satellites in the space to find out where it is. Therefore it needs a clear view of the sky.
Tall buildings and other objects that block the receiver’s view to the sky make it infeasible to determine
your location. Sometimes the satellites are not overhead but near the horizon. In these cases the GPS
must have a clear view of the horizon.
Other Comments-
Please allow an adequate amount of time for the GPS receiver’s boot-up (TTF) to complete before
contacting Technical Support.