Nautical Ninja
Understand your boat's performance
Browse, compare, and analyze polar diagrams for hundreds of production sailboats. A polar diagram shows your boat's theoretical maximum speed at every combination of true wind angle and wind speed — your performance envelope. Use it to set realistic targets, identify where you're losing speed, and understand how your boat should behave in any conditions.
Polars for hundreds of production sailboats — search by name or LOA.
Interactive diagram showing speed at every wind angle and wind speed.
Exact target speeds in a tabular format — easy to read at the helm.
Download polar data for use in navigation software like OpenCPN.
Evaluating a boat to buy Compare performance between similar designs — see which is faster upwind, downwind, or in light air.
Race preparation Know your target speed at every point of sail so you have a benchmark to aim for on the racecourse.
Diagnosing slow boat speed If you're consistently underperforming the polar, something is wrong — bottom, sails, or sail trim.