Hi everyone,

I wrote a program that parses serial data from EM-406 GPS receiver with a GPS evaluation board, but I am stuck though. I am unable to save a .txt with the parsed GPS data continuously. Like below:

$GPGGA,023030.116,3409.0176,N,11814.8322,W,1,03,7.9,179.4,M,-33.3,M,,0000*6A

I want to be able to save like a logging function.
My program so far.
import processing.serial.*; //serial port read library
Serial com7;
String data;
Float Latitude1 = 0.0;
String Latitude;
String NorSindicator;
Float Longitude1 = 0.0;
String Longitude;
String EorWindicator;
String Satellites;
String  Altitude;
String gpsdata;

void setup(){
 size(800,200); //window size
 PFont myFont = createFont(PFont.list()[2],16); // font type
 textFont(myFont);
 
 noStroke();
 smooth();
 println(Serial.list()); // displays port numbers for program
 com7 = new Serial(this, Serial.list()[4], 4800); // serial read setup
 com7.bufferUntil('\r'); // library buffer
}
void draw(){
 background(0);
 fill(255);
 // window display
 textAlign(LEFT);
 text(" Latitude: " + Latitude + " Longitude: " + Longitude, 20,30);
 text(" Position: " + NorSindicator + "   " + EorWindicator, 20,50);
 text("Satellites Used:  "+ Satellites, 20,70);
 text(" Altitude: "+ Altitude + " Meters", 20,90);
 text(" GPS unparsed: "+ gpsdata, 20,110);
 
 
}
// function reads the gps data and sends it to the parsing function
void serialEvent(Serial com7) {
 String data = com7.readStringUntil('\n');
 if( data != null) {
   println(data);
   parseString(data);
}
 }
 //parsing function
void parseString (String serialString) {
  //sets up an array and splits the gps info by comma
  String items[] = split(serialString,',');
  if(items[0].equals("$GPGGA")) {  //looks for the GPGGA info
    getGGA(items);
   
  }
}
//this function assigns the variables
//to array elements that have been parsed
void getGGA(String[] gpsinfo){
//if (gpsinfo[1].equals("A")){
 Latitude1 = float(gpsinfo[2])/100.0;
 Latitude = nfs(Latitude1, 3,2);
 NorSindicator = gpsinfo[3];
 Longitude1 = float( gpsinfo[4])/100.0;
 Longitude = nfs(Longitude1, 3,2);
 EorWindicator = gpsinfo[5];
 Satellites = gpsinfo[7];
 Altitude = gpsinfo[9];
 gpsdata = join(gpsinfo,",");
 
 }

I've used the saveStrings() haven't been able to figure it out.
Any Help would be appreciated.