I'm afraid, you are on wrong track!
GNSS means Global Navigation Satellite Systems, and it covers GPS (USA), Glonass (Russia), Galileo (EU) and Beidu (China).
In WinCE environment, the device (chipset) and navigation program communicates via NMEA sentences, it is independent from used satellite system.
Try to find the appropriate portnumber from WinCE settings.
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