Module polar 

Boat performance polars, and the tactical numbers built on one.

A polar table states a boat’s expected speed for a given wind angle and strength, values that depend on hull and rig and cannot be computed from a formula. crate::sailing::tack_legs and crate::sailing::close_hauled_headings_deg take the beat angle as a caller-stated number; Polar::best_upwind_angle_deg derives it instead, from the polar itself.

What is not modelled

Sea state, reefing points, and crew skill are not modelled. A polar is a prediction, usually from a velocity prediction program or a measured racing record, not a live reading. Nothing here compares it against how the boat is actually sailing.

Structs

Polar

A boat’s expected speed for every true wind angle and speed on a grid.

Enums

PolarError

Something wrong with a polar table.