Anti - Collision Radar Navigation : The Keystone System by Hengst, Christian - 1964

Codan Marine, 1964 84 pages, staple bound, line drawings, author's inscription on title page. Covers are clean, slight sun fade at spine area, tiny split in side edge of rear cover. The Keystone System of Anti-Collision Navigation consists of two triangles, five lines and two resolutions. Contents include: The Radar Set; Relative Motion; Consecutive Radar Scope Displays; The (AB) Line, Point (F), and Point (E); Computed Triangle (ABC); Predicted Triangle; Gyro-Stabilized Reflection Plotter; etc