title: iPhone: calculate distance while walking using GPS
body: <p>I want to calculate the distance that users cover while walking using GPS. For example a user taps the start button and starts to walk or run than when he done he taps stop. What will be the minimum distance user has to travel to get the different lat long?</p>
  
  <p>How can we do it in IPhone, asume we take Lat, long after every 0.3 sec than in the last we have a list of points?</p>