Graphically visualize and calculate the vectors of apparent wind, true wind, boat speed and VMG (Velocity Made Good: in the direction of true wind).

Useful to calculate these values in different conditions.

Intuitive and explanatory of the fluctuations upon changing course.

Visualize the windshadow of the boat, and how it changes in different contitions.

DEMO Youtube video: https://youtu.be/K4AkKVfZRTs