Device for allowing materialization of close-hauled edges on map in e.g. navigation sailboat, has circular plate superimposed and fixed to square support at center of circular plate and freely rotated on square support at center

摘要

The device has a circular plate superimposed and fixed to a square support at center of the circular plate. The circular plate freely rotates on the square support at the center, where the plate includes figures, letters and symbols. Indications on a surface side of the support materialize a wind axis, visualize a position of a boat with respect to the wind, and provide corrections for sailboats to achieve high performance at 45 degrees of wind.