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  1. #1
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    Arrow Creating/Validating NMEA Checksum

    I am creating my own own custom NMEA string (to maximize bandwith required) but I need an example on how to create the checksum value.

    An example in Java would be GREAT! For the benefit of others, you may be an expert with C and would like to offer an example as well.

  2. #2
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    Re: Creating/Validating NMEA Checksum

    Check http://www.gpsinformation.org/dale/nmea.htm page for any information about NMEA strings.
    The checksum field consists of a '*' and two hex digits representing an 8 bit exclusive OR of all characters between, but not including, the '$' and '*', so it's not a sophisticated checksum.

  3. #3
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    Cool Re: Creating/Validating NMEA Checksum

    Jack

    Bless you fulla. I can see what the checksum is. To be honest I do not know explicitly what it is used for nor how to create it. I merely wish to follow protocol if I am going to define my own sentences. Not that I really need to, to be fair...

  4. #4
    Super Contributor
    Join Date
    Oct 2005
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    Re: Creating/Validating NMEA Checksum

    Quote Originally Posted by rjcauc81hi View Post
    Jack

    Bless you fulla. I can see what the checksum is. To be honest I do not know explicitly what it is used for nor how to create it. I merely wish to follow protocol if I am going to define my own sentences. Not that I really need to, to be fair...
    Hi,

    See this link it containes some information about checksum of NMEA.

    http://www.codepedia.com/1/Calculati...NMEA+Checksums

    And you can also get lots of other results by just googling with key words "Ckecksum NMEA"

    Regards,
    Peter

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