Calculate NMEA-0183 XOR checksum — nmea

This function calculates the checksum for NMEA-0183 G*GGA strings.

nmea_check(string = NULL)

Arguments

string: A string with valid NMEA-0183 G*GGA structure.

Value

Logical; TRUE if checksum is correct.

Examples

# first G*GGA msg from data('n38_demo')
msg_1 <- "$GPGGA,015808.00,2726.53758,S,15126.05255,E,1,08,1.0,365.1,M,39.5,M,,*79"
msg_2 <- "$GPG5808.00,2726.53758,S,15126.05255,E,1,08,1.0,365.1,M,39.5,M,,*79"
chk_1 <- em38:::nmea_check(string = msg_1)
chk_2 <- em38:::nmea_check(string = msg_2)