Nokia 12 GSM MODULE REMOTE I/O - Manual (Page 47)

9.3.9 Location information
Figure 11. GPS support configured to serial port 1
You can query location information from the Nokia 12 GSM Module if an
external GPS device is connected to either the serial port 1 or 3. The serial port
used has to be configured with Nokia 12 Configurator, see Figure 11.
Note: If you have selected serial port 3 for GPS support, Java cannot use the serial
port.
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