ARDUINO + GPS = INDICATOR LIMIT AREA

#include <string.h>
#include <ctype.h>
#include <LiquidCrystal.h>
 int ledPin1= 10; // LED test pin
 int ledPin2= 9; //LED warning limit
 int ledPin3= 8; //LED warning over limit
 int rxPin = 0;                    // RX PIN
 int txPin = 1;                    // TX TX
 int rx_val =0 ;
 int byteGPS=-1;
 char linea[300] = "";
 char comandoGPR[7] = "$GPRMC";
 int cont=0;
 int bien=0;
 int conta=0;
 int indices[13];
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 void setup() {
   pinMode(10,OUTPUT);       // Initialize LED pin
   pinMode(9, OUTPUT);
   pinMode(8, OUTPUT);
   pinMode(rxPin, INPUT);
   pinMode(txPin, OUTPUT);
   lcd.begin(16,2);
   lcd.setCursor(0,0);
   lcd.print("Lat:");
  //lcd.setCursor(0,1);
  //lcd.print("Long:");
   Serial.begin(4800);
   for (int i=0;i<300;i++){       // Initialize a buffer for received data
     linea[i]=' ';
   }
 }
 void loop() {
   digitalWrite(10,HIGH); //indikator  runing data reciver
   byteGPS=Serial.read();    // Read a byte of the serial port
   //lcd.write(Serial.read()); // TAMBAHAN
   if (byteGPS == -1) {           // See if the port is empty yet
     delay(100);
   } else {
     // note: there is a potential buffer overflow here!
     linea[conta]=byteGPS;        // If there is serial port data, it is put in the buffer
     conta++;
     Serial.write(byteGPS);

     if (byteGPS==13){            // If the received byte is = to 13, end of transmission
       // note: the actual end of transmission is <CR><LF> (i.e. 0x13 0x10)
       digitalWrite(10, LOW);
       cont=0;
       bien=0;
       // The following for loop starts at 1, because this code is clowny and the first byte is the <LF> (0x10) from the previous transmission.
       for (int i=1;i<7;i++){     // Verifies if the received command starts with $GPR
         if (linea[i]==comandoGPR[i-1]){
           bien++;
         }
       }

       if(bien==6){               // If yes, continue and process the data
         for (int i=0;i<300;i++){
           if (linea[i]==','){    // check for the position of the  "," separator
             // note: again, there is a potential buffer overflow here!
             indices[cont]=i;
             cont++;
           }
           if (linea[i]=='*'){    // ... and the "*"
             indices[12]=i;
             cont++;
           }
         }
         Serial.println("");      // ... and write to the serial port
         Serial.println("");
         Serial.println("---------------");
         for (int i=0;i<12;i++){
           switch(i){

             case 0 :Serial.print("Time in UTC (HhMmSs): "); break;
             case 1 :Serial.print("Status (A=OK,V=KO): ");break;
             case 2 :Serial.print("Latitude: ");break;
             case 3 :Serial.print("Direction (N/S): ");break;
             case 4 :Serial.print("Longitude: ");break;
             case 5 :Serial.print("Direction (E/W): ");break;
             case 6 :Serial.print("Velocity in knots: ");break;
             case 7 :Serial.print("Heading in degrees: ");break;
             case 8 :Serial.print("Date UTC (DdMmAa): ");break;
             case 9 :Serial.print("Magnetic degrees: ");break;
             case 10 :Serial.print("(E/W): ");break;
             case 11 :Serial.print("Mode: ");break;
             case 12 :Serial.print("Checksum: ");break;
           }
          for (int j=indices[i];j<(indices[i+1]-1);j++){
             Serial.print(linea[j+1]);
             lcd.print(linea[j+15]);
             delay(0);

           // lcd.setCursor(5,1);   // set cursor valLong :
           //  lcd.print(linea[j+35]);
           //  delay(0);

            if (linea[j+21]>4 ){
             digitalWrite(9, HIGH); //indikator warning limit
             }else{
             digitalWrite(9, LOW);
            // delay(100);

             if (linea[j+21]>9 ){
             digitalWrite(8, HIGH); //indikator over limit
             }else{
             digitalWrite(8, LOW);
            // delay(100);

             }
               }

           }

           Serial.println("");
         }
         Serial.println("---------------");
       }
       conta=0;                    // Reset the buffer
       for (int i=0;i<300;i++){    //
         linea[i]=' ';
       }
     }
   }
           lcd.setCursor(4,0); // set cursor val Lat :

 }