If your GPS is handle by Windows (case of Windows Mobile 6 and some Windows Mobile 5)
Normally, the button "Search" of the GPS setup window should be active.
Simply click on it.
Otherwise
On your PDA, in the Windows Start menu, choose Settings, then the System tab and the icon GPS
The COM of your GPS is the 'GPS program port'
It is up to you to configure NoniGPSPlot
For previous versions, finding the material port of GPS
Download CEMonitor .
Unzip and copy the cemonitor.exe file to your PDA.
Run cemonitor.exe on your PDA.
Click on the blue arroy at the bottom.
Menu Tools / Port Setting
If you know the COM of your GPS, select it and go to step 4
Otherwise select the COM1 then OK
Wait for few seconds…
If nothing append, select the COM2 (with the Menu Tools / Port Setting)
Repeat operation until the blue light start to flash at the right bottom (GPS time should also appear).
Rememeber the COM and rate displayed
If your GPS is not in mode NMEA you'd better to je vous conseil de reset the NMEA parameters.
Menu Tools / Command / NMEA
Click on Default and then OK