NED is your virtual sailing instructor. NED will teach you how to correctly trim the sails on almost any sailboat with a mainsail and headsail.

Your sails will be correctly trimmed when your boat speed reaches its maximum for any particular wind speed and direction.

You can turn the boat into or away from the wind, let the sails out or tighten them up and you can adjust the speed of the wind.

NED represents the real world polar plot of a real racer cruiser sailboat. It’s the closest thing you can get to sailing instruction online.