Special Features:

One twist of the azimuth allows to measure the true course or to determine the magnetic course, includes scales for the sectional terminal area and wac charts in ststute and nautical miles

Properties:

An item generally constructed on a transparent plastic material. It embodies a standard inch scale, an inner and/or outer statue mile scale, a vertical statue mile scale, and may also include a nautical mile scale. The semicircular protractor portion may be offset or inset in forming a part of the item. It is designed to be used in plotting courses, measuring distances between two points on a chart or map, establishing meridians of references, solving wind angles, and determining bearing positions.