title: Distance calculator between the ports
body: <p>I have a port database which contain nearly 10k port names and its corresponding locations.I want to find the distance between the ports.</p>
  
  <p>Form my understanding using Google distance matrix API, we can only able to find distance between the two points for a set of specific travel modes like bicycle,driving,walking and internal transit.</p>
  
  <p>But In my case I want to find the distance between two ports during the ship voyage. If anyone done Similar sort of work please share your knowledge...</p>
  
  <p>Reference website : [<a href="http://www.portworld.com/map]" rel="nofollow">http://www.portworld.com/map]</a></p>
  
  <p>Thanks!</p>