title: Google Maps API custom marker animation and orientation along path
body: <p>I am trying to create a Google Map app that shows a route from a source to a destination in a straight line ('as the crow flies').
  I have the general app working.
  I can put in a start and an end destination and it will slowly draw a line from start to finish.
  Also, I have a generic marker that moves along the straight line route from start to finish.
  What I want to do is replace the generic marker with a custom drawn marker.  Also, I would like the custom marker to be oriented so that it is in line with the route.
  In other words if the custom marker is a car I would want the car to be facing the right direction as it goes along the route.</p>
  
  <p>I see this demo, but I am not sure how they are doing this.
  <a href="http://www.morethanamap.com/demos/visualization/flights" rel="nofollow">http://www.morethanamap.com/demos/visualization/flights</a></p>
  
  <p>Any suggestions?</p>
  
  <p>Thanks!</p>