Nmea checksum
Supplementary consecutive interior angles
Note that only those NMEA sentences will be sent that are checked in the "NMEA sentences" panel. All sentences are shown in the I/O Port Monitor as they are output. When logging is ON (toolbar option), the sentences will also be written to the user selected log file.
3 CKSUM is a two-hex character checksum as defined in the NMEA specification. Use of checksums is required on all input messages.