title: How to correct middle coordinate between two coordinates
body: <p>I have app that draw red line on the apple map while user drive car with iPhone.<br/>
  But sometimes when driver drives too fast on corners I don't get all coordinates so it connects two points with straight line (and I get flying car :)).<br/>
  Is there any solution how to make this more precise.<br/>
  On the image I show what happens.<br/>
  Large error on this image is at 'terminal ave and Clark...'<br/>
  As user drive car I store each new coordinate in database (local) and based on that I draw route.<br/>
  But this errors drive me creasy.<br/>
  Any idea or example how to fix this error on corners.<br/>
  <img src="https://i.stack.imgur.com/6rt8p.png" alt="enter image description here"></p>