import time
import serial
import string
from pynmea import nmea

ser = serial.Serial()
ser.port = "/dev/ttyACM0"
ser.baudrate = 9600
ser.timeout = 1
ser.open()
gpgga = nmea.GPGGA()

print ("begi")

while True:
    data = ser.readline()
    if data[0:6] == '$GPGGA':
        ##method for parsing the sentence
        gpgga.parse(data)
        lats = gpgga.latitude
        print  "Latitude values : " + str(lats)