NMEA 0183是美國國家海洋電子協會（National Marine Electronics Association ）為海用電子設備制定的標準格式。目前業已成了GPS導航設備統一的RTCM（Radio Technical Commission for Maritime services）標準協議。
以下面的數據為例：

$GPGGA,022206.00,3905.87672799,N,11704.89762467,E,4,32,0.5,39.2934,M,-7.5829,M,02,0000*41 $GNGST,022207.00,0.00,0.02,0.01,161.8102,0.02,0.01,0.05*74 $GPGSV,2,1,07,10,30,308,43,15,50,054,50,20,59,312,47,21,49,229,47*7F $GPGSV,2,2,07,24,71,118,51,27,02,300,37,32,08,258,41*41 $GLGSV,2,1,07,66,46,058,48,82,29,260,44,76,43,059,47,77,38,150,43*66 $GLGSV,2,2,07,81,09,213,40,67,48,329,48,68,06,291,39*57 $GAGSV,2,1,06,04,69,007,48,09,33,287,43,11,35,240,41,12,10,190,37*65 $GAGSV,2,2,06,19,25,078,32,01,38,114,43*66 $BDGSV,3,1,10,01,37,146,43,02,34,226,38,03,43,190,42,06,72,343,47*6C $BDGSV,3,2,10,08,26,191,41,09,57,287,44,13,39,210,42,16,70,329,49*66 $BDGSV,3,3,10,04,26,124,38,05,16,249,36*6D

每一行末尾的“星號”后面都有兩位校驗，是本行字符串中將“美元符號”和“星號”之間的每一個字符從左至右依次進行異或等于運算而得到的。（試了好幾次，特殊符號不能正常顯示，以后再來研究。）
下面以計算一條GPGGA的校驗和為例，放出C語言計算代碼：

#include <stdio.h>int main() {char str[] = "$GPGGA,022206.00,3905.87672799,N,11704.89762467,E,4,32,0.5,39.2934,M,-7.5829,M,02,0000*41";int i = 0;int result = str[1];for(i = 2; str[i] != '*'; i++){result ^= str[i];}printf("result=%x\n", result);return 0; }

計算結果：

result=41

計算結果與GPGGA中的校驗和一致。

總結

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