To start using the tool:

• Click on the ruler button to start
• Click on the starting point and continue clicking at each waypoint until you reach your destination.
• To stop the drawing click the ruler button again or press the ESC key
• To clear all drawings click the ruler button once more or press the ESC key

Tips:

• To use a sailing map just enable it at the upper right corner
• To find the coordinates of a point just move it in the center of the map. The cordinates are displayed in the bottom left corner