An exact duplicate of the one formerly distributed by the U.S. Naval Oceanographic Office. It portrays graphically the altitude and azimuth of the fifty-seven numbered stars in the Nautical and Air Almanacs. Additional celestial bodies may be plotted on the star base. Special diagrams permit rapid check of hour angle, and also provide means of finding the altitude and azimuth of unplotted bodies.
The starfinder provides the best way to identify isolated stars and planets in view, or to predict the locations of bodies not yet in view. It also helps the navigator predict and plan the best star-planet-moon combinations. Although some navigators tend to feel that use of the 2102-D is optional, in fact, serious navigation demands facility with it.
The unit consists of a dual star base, nine altitude azimuth templates centered at 10 intervals of latitude, meridian angle diagram and instruction sheet.