Class NmeaSentence

Represents a NMEA data sentence typically used in GPS/GNSS systems.

Assembly: Meadow.Contracts.dll

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Declaration

public class NmeaSentence

Properties

StartingDelimiter

The first character in the sentence. Usually $, but AIVDM/AIVDO sentences might start with !.

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Declaration

public string StartingDelimiter { get; set; }

TalkerID

The first two letters (after the starting delimiter) comprise the Talker ID, which describes the system in use, for instance "GL" means that the data came from the GLONASS system. "BD" means BeiDou, etc.

Default value is "GP".

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Declaration

public string TalkerID { get; set; }

TalkerSystemName

Retrieves the full name associated with the TalkerID via the KnownTalkerIDs property of the Lookups class.

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Declaration

public string TalkerSystemName { get; }

Prefix

The prefix, excluding the $ symbol and first two letters of the sentence, i.e.: RMC.

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Declaration

public string? Prefix { get; set; }

DataElements

A list of strings that represent the data elements within a NMEA sentence, between the prefix and the checksum data.

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Declaration

public List<string> DataElements { get; set; }

Checksum

The checksum data of the data elements. Calculated by XORing all of the data elements.

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Declaration

public byte Checksum { get; }

Methods

GetDataString()

Returns the NMEA sentence string without the checksum digits.

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Declaration

protected string GetDataString()

Returns

System.String

ToString()

Returns a fully-expressed NMEA data string, including the prefix, data elements, and checksum information.

I.e.: $GPRMC,000049.799,V,,,,,0.00,0.00,060180,,,N*48

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Declaration

public override string ToString()

Returns

System.String: A string of the sentence.### From(string) Creates a Meadow.Peripherals.Sensors.Location.Gnss.NmeaSentence from a string. Will parse the prefix, data elements, and also validate the checksum. If the checksum is invalid, it will throw an System.ArgumentException, therefore this should be used in a try/catch block.

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Declaration

public static NmeaSentence From(string sentence)

Returns

Meadow.Peripherals.Sensors.Location.Gnss.NmeaSentence: A NmeaSentence class representing with the NMEA information loaded.

Parameters

Type	Name	Description
System.String	sentence	A NMEA sentence string.