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

TinyGPSPlus gps;
SoftwareSerial gpsSerial(9,8);

const double LONDON_LAT = 51.508131;
const double LONDON_LON = -0.128002;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  gpsSerial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(gpsSerial.available() > 0){
    if(gps.encode(gpsSerial.read())){

      if(gps.location.isValid()){

        double latitude = gps.location.lat(); 
        double longitude = gps.location.lng(); 

        Serial.print("Latitude: ");
        Serial.println(latitude);
        Serial.print("Longitude");
        Serial.println(longitude);

        double distanceKm = TinyGPSPlus::distanceBetween(latitude, longitude, LONDON_LAT, LONDON_LON) / 1000;

      }

      if(gps.altitude.isValid()){
        Serial.println(gps.altitude.meters());
      }

      if(gps.speed.isValid()){
        Serial.println(gps.speed.kmph());
      }

      if(gps.date.isValid()){
        Serial.print(gps.date.year());
        Serial.print(gps.date.month());
        Serial.print(gps.date.day());
      }

      if(gps.time.isValid()){
          Serial.print(gps.time.hour());
          Serial.print(gps.time.minute());
          Serial.print(gps.time.second());
      }

      if(gps.hdop.isValid()){
        Serial.print(gps.hdop.hdop());
      }
    }
  }
}