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5. Troubleshooting
Problems Reasons Methods
Weak or no GPS
signal can be
received at the
current location.
Connect an external
antenna (optional) to the
connector on top of your
GR-239, and then run the
GPSViewer with cold start
again.
No position output
but the timer is
counting.
When outdoors,
GPS signal is
blocked by building
or car roof.
Go to an open space and
run GPSViewer Cold start
function and try again, or
connect an external
antenna to improve signal
reception.
GPS doesn’t work.
Bluetooth function
unstable.
Turn the GR-239 off and
on again. Restart your
PDA or PC. If it still fails
to operate, reinstall the
software as described in
4.5 Bluetooth Installation.
COM port cannot
detect the GR-239
Bluetooth Receiver.
Incomplete
installation or other
device is using the
same COM port.
Complete the installation
of the GR-239 Bluetooth
Receiver or stop the other
device which is using the
COM port.
Cannot detect GR-
239 Bluetooth
Receiver.
Poor connection. Restart your PDA or PC
and make sure the device
is connected correctly.
21


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