Star Finder 2102D

"The Star Finder 2102-D" is the standard astronomical navigation star finder for professional navigators. The star finder consists of separate templates for each 10 degrees latitude and the 57 standard stars used in the Air and Nautical Almanacs and Sight Reduction Tables can be located and identified on the star finder. The templates can be used for north or south latitudes on the base template. Comes in a plastic holder with explanation. Diameter of templates are 217 mm.