Absolute Wind Direction (real direction wind is coming from) Set East = 0° range = -180° to +180° Data needed: Relative Wind Direction Absolute Wind Direction = Absolute Compass + Relative Wind Vane Values to Calculate Absolute Angle-to-Waypoint (direction from boat to destination) range is -180° to +180° or 0 to 360° Starting point is (x1, y1), destination waypoint is (x2, y2) Data needed: GPS location of boat and destination, or just difference Angle-to-Waypoint = arctan (y2 y1/ x2 x1) Absolute – –
Absolute Wind Direction (real direction wind is coming from) Set East = 0° range = -180° to +180° Data needed: Relative Wind Direction Absolute Wind Direction = Absolute Compass + Relative Wind Vane Values to Calculate Absolute Angle-to-Waypoint (direction from boat to destination) range is -180° to +180° or 0 to 360° Starting point is (x1, y1), destination waypoint is (x2, y2) Data needed: GPS location of boat and destination, or just difference Absolute Angle-to-Waypoint = arctan (y2 – y1/ x2 – x1)