SHIFT + CLICK FLAG Space + click and drag from point a to point b. The algorithm will automatically calculate the shortest route. Press D to toggle drawing the full path. Press H to show/hide variables. Press M to manually input coordinates. Hold down 1 or 2 and drag to adjust one of the two points.
This project was made with the help of Movable Type Ltd, whose goal is to provide people with free-to-access information sets. The webpage i used: http://www.movable-type.co.uk/scripts/latlong.html © Marcus Koh 2016