Autonomous robot drive in straight line using GPS

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this is the code of GPS and the one that I give ups there is the combined and Im not really sure is that is the correct coding for moving the robot. I want the robot to move in a straight line by using the latitude and longitude info from the GPS


#include <TinyGPS++.h>
#include <TinyGPSPlus.h>
//#include <TinyGPS++.h>
#include <SoftwareSerial.h>

static const int RXPin = 3, TXPin = 2;
static const uint32_t GPSBaud = 9600;

// The TinyGPS++ object
TinyGPSPlus gps;

// The serial connection to the GPS device
SoftwareSerial ss(RXPin, TXPin);

void setup(){
  Serial.begin(9600);
  ss.begin(GPSBaud);

}

void loop(){
  // This sketch displays information every time a new sentence is correctly encoded.
  while (ss.available() > 0){
    gps.encode(ss.read());
    if (gps.location.isUpdated()){
      Serial.print("Latitude= "); 
      Serial.print(gps.location.lat(), 6);
      Serial.print(" Longitude= "); 
      Serial.println(gps.location.lng(), 6);
    }
  }
}