Use the first section of the tool to calculate the checksum for a NMEA0183 sentence. In this case the calculated checksum is 0x24 hexadecimal. First paste your NMEA0183 sentence in the input field and click the "Calculate" button to generate the same sentence with the checksum field included.įor example, when pasting the sentence " $GPVTG,230.0,T,231.3,M,3.0,N,5.6,K,D" into the text box, the generated sentence in the result section will be: " $GPVTG,230.0,T,231.3,M,3.0,N,5.6,K,D*24". To calculate a checksum for a NMEA0183 which doesn't contain a checksum field already, you can use the first section of the application. The NMEA0183 Checksum Calculator can be found in the Hydromagic installation folder. Start the tool by double clicking or tapping the "NMEAChecksum.exe" executable program. In most cases it is installed in "C:\Program Files\Eye4Software\Hydromagic\Program\" or "C:\Program Files (x86)\Eye4Software\Hydromagic\Program\" when using the 32 bit version of the software on a Windows 64 bit operating system. The tool can be found in the installation folder of Hydromagic. NMEA0183 data fragment with checksum values highlighted. Example: $TTSSS,FIELD,1,FIELD,2,FIELD,*5C. This checksum is two characters long (hexadecimal characters in the range 0.F). If this is done, an asterisk (*) will appear first, followed by the hexadecimal representation of the XOR binary operation of all characters between the '$' and the '*'. When a device is transmitting NMEA0183 sentences, a checksum may be added to the end of the message. Generate or check NMEA0183 checksums with the freeware tool. If NMEA0183 sentences are rejected by the Hydromagic software for no reason, you can also check the validity of received or logged NMEA0183 sentences using this tool. It can be used by hardware or software developers to make sure their device or software transmits correct NMEA0183 sentences. The NMEA0183 Checksum Calculator is a freeware tool which is shipped with Eye4Software Hydromagic.
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