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No matter as a surveyor or other ordinary people, everyday we are using GNSS (Global Navigation Satellite System) in our daily work or life, such as GPS and BDS. Have you ever wondered how GNSS works?

As a surveyor, you've probably heard the word NMEA or GPGGA many times. Such as when using a GNSS device with an echo sounder, it always requires NMEA-0183 data stream from GNSS device to the echo sounder.