title: drawing great circle arc with Basemap knowing starting point and a bearing
body: <p>I would like to draw a great circle arc on maps.</p>
  
  <p>The function <code>drawgreatcircle()</code> in Basemap is usefull as long as you know the latitude and longitude of the starting and the destination points on the map.</p>
  
  <p>My problem is that I have the starting point and a bearing in degrees referenced to the North pole.</p>
  
  <p>Applications : Radio Direction Finding by triangulation.</p>