Parser for NMEA messages. Currently parses GSV, GGA, GSA, GLL, GMC, VTG and TXT

The parser parses message like '$GNGLL,4513.13795,N,01859.19702,E,143717.00,A,A*72'

    ...
    _parser = new NmeaParser();

    _parser.NmeaMessageParsed += NmeaMessageParsed;

    _parser.Parse(sentence);
    ...

    private static void NmeaMessageParsed(object sender, NmeaMessage e)
    {
        Console.WriteLine($"{e}");
        
        if (e is GnrmcMessage)
        {
           // Use message
        }   
    }

Once the message is parsed, a derived NmeaMessage is made available in the 'NmeaMessageParsed' event.

If you have multiple NMEA devices please check out the 'NmeaParserList' class. This class is designed to support multiple parsers without crossing input.

The event is used because some NMEA messages are splitted up in multiple sentences like GSA and GSV.

For these messages, the result is buffered. Once the complete message is made available, the event is raised.

The location degrees are calculated as decimal degrees.

    (d)dd + (mm.mmmm/60) (* -1 for W and S)

For testing purposes, a reader for serial ports is added in the test application. If uses .Net Standard System IO access to serial ports.

The example app only supports Windows due to the usage of the System.IO.Ports library.

You can use this library as a Nuget Package:

Install-Package svelde-nmea-parser -Version 1.0.5

The following devices are used to test the parser:

• BEITIAN USB GNSS GPS Receiver BN-85U (U-Blox UBX-M8030)
• Webio GRB-288 Bluetooth GPS mouse
• GSpace GS-R238 GPS mouse (SiRFstarIII)

Note: If you want to have your GPS device tested and officially supported here, please send me a DM on github or twitter @svelde

This code is used in the Azure IoT Edge module iot-edge-nmea.

You can check it out on Docker Hub.

The code of this logic is open source and licenced under the MIT license.

Want to contribute? Throw me a pull request....

Want to know more about me? Check out my blog.