![]() (c) Keeping the index at this point, align the 0- to 180-degree line of the protractor on the vertical grid line. (b) Place the index of the protractor at the point where the drawn line crosses a vertical (north-south) grid line. (a) Draw a line connecting the two points (A and B). The 0- or 360-degree mark is always toward the top or north on the map and the 90° When using the protractor, the base line is always oriented parallel to a north-south grid line. Where the base line intersects the horizontal line, between 90 and 270 degrees, is the index or center of the protractor ( Figure 6-6).ī. A line from 0 to 180 degrees is called the base line of the protractor. The degree scale is graduated from 0 to 360 degrees each tick mark on the degree scale represents one degree. This protractor represents the azimuth circle. ![]() The military protractor, GTA 5-2-12, contains two scales: one in degrees (inner scale) and one in mils (outer scale). The index mark is the center of the protractor circle from which all directions are measured.Ī. All of them divide the circle into units of angular measure, and each has a scale around the outer edge and an index mark. There are several types of protractors-full circle, half circle, square, and rectangular ( Figure 6-5). Precision lightweight global positioning system receiver Navigation in different types of terrainĬ. SurvivalIQ Handbook: Land Navigation - Direction - Protractorġ3.
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