title: Great Circle & Rhumb line intersection
body: <p>I have a Latitude, Longitude, and a direction of travel in degrees true north. I would like to calculate if I will intersect a line defined by two more Lat/Lon points.</p>
  
  <p>I figure the two points defining the line would create my great circle and my location and azimuth would define my Rhumb line. </p>
  
  <p>I am only interested in intersections that will occur with a few hundred kilometers so I do not need every possible solution.</p>
  
  <p>I have no idea where to begin.</p>