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

SoftwareSerial gpsSerial(3, 4); // RX: 3, TX: 4 (arduino)
TinyGPSPlus gps;			

void setup() {
  Serial.begin(9600); // baudrate of arduino
  gpsSerial.begin(9600); // baudrate of gps
}

void loop() {
  if (gpsSerial.available() > 0) {
    if (gps.encode(gpsSerial.read())) {
      if (gps.location.isValid()) {
        Serial.print(F("Latitude: ")); // F() stores the string "Latitude: " in flash memory instead of RAM.
        Serial.print(gps.location.lat(), 7);

        Serial.print(F("Longitude: "));
        Serial.print(gps.location.lng(), 7);

        Serial.print(F("Altitude: "));
        if (gps.altitude.isValid())
        Serial.println(gps.altitude.meters());
        else
        Serial.println(F("INVALID"));
      } else {
        Serial.println(F("Location: INVALID"));
      } // end of else for location

        Serial.print(F("Speed: "));
        if (gps.speed.isValid()) {
        Serial.print(gps.speed.kmph());
        Serial.println(F(" km/h"));
      } else {
        Serial.println(F("INVALID"));
      } // end of else for speed

        Serial.print(F("Date: "));
        if (gps.date.isValid()); {
        Serial.print(gps.date.year());
        Serial.print(F("-"));
        Serial.print(gps.date.month());
        Serial.print(F("-"));
        Serial.print(gps.date.day());
      } else {
        Serial.println(F("INVALID"));
      } // end of else for date

      Serial.print(F("Time: "));
      if (gps.time.isValid()); {
        Serial.print(gps.time.hour());
        Serial.print(F(":"));
        Serial.print(gps.time.minute());
        Serial.print(F(":"));
        Serial.print(gps.time.second());
      } else {
        Serial.println(F("INVALID"));
      } // end of else for time

      Serial.println();
    } // end of if (gps.encode(gpsSerial.read()))
  } 

  // detects if there is communication gps issue
  if (millis() > 5000 && gps.charsProcessed() < 10)
    Serial.println(F("No GPS data received"));

} // end of loop