I get this error: warning: multi-character character constant [-Wmultichar]
String gpsData = "";
void gpsUpdate(){
delay(1);
while(Serial.available()){
char in = Serial.read();
if(in == '$'){
Serial.println(gpsData);
gpsData = "$";
} else if(in != '\n\r'){
gpsData.concat(in);
}
}