Windage in sailing refers to the aerodynamic resistance or drag exerted by the wind on a vessel’s above-water structures, such as the hull, rigging, mast, and deck gear (e.g., dodgers, dinghies, radar). High windage makes steering and maneuvering difficult, often causing excessive drifting, reduced upwind performance, and increased drag.

Key Aspects of Windage:
Impact on Performance: Increased windage lowers a boat's ability to sail close to the wind and reduces its stability margin.

High Windage Causes: Large, high superstructures, towering masts, stowed inflatable dinghies, or significant deck equipment increase drag.

Handling Issues: High-windage boats are difficult to manage in close quarters, as wind forces can easily push the boat sideways ("slipping"), acting like a sail when one is not desired.