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When measuring an azimuth, the reading is always to the nearest degree or 10 mils. This is the grid direction line (azimuth). (d) Remove the protractor and draw a line connecting the known point and the mark on the map. (c) Make a mark on the map at the desired azimuth. (b) Place the protractor on the map with the index mark at the center of mass of the known point and the base line parallel to a north-south grid line. (a) Convert the azimuth from magnetic to grid, if necessary. (2) To plot an azimuth from a known point on a map ( Figure 6-7). (d) Read the value of the angle from the scale this is the grid azimuth from point A to point B ( Figure 6-4).
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(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. It has a spring mechanism and a handle attached on the top.SurvivalIQ Handbook: Land Navigation - Direction - Protractorġ3. The shorter pivoting arm extends the radius of the protractor. At its outer edge is a small round handle for rotation.
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This arm extends well beyond the circumference of the protractor and acts as a straight-edge. The outer scale begins with 350° followed after ten increments by 0° and then increses to 190° on the right.Īttached to the longest pivoting arm is a conical brass window piece that slides over the protractor circumference revealing the degree scales through the cutout window. The inner scale begins with 190° and reduces incrementally to 0° followed after ten increments by 350°. The circumference of the semi-circle is divided into degrees that are marked with two scales. In the center of the diameter is a small brass circle with a window in the center marked with a black cross for accurate placement of the instrument. Instrument consists of a brass semi-circular protractor with two pivoting brass arms attached to the center of the diameter. The inside of the case is lined with black fabric and the leftmost edge is slightly extended such that the protractor will slide under the lip when stored. Description Protractor is stored in a rectangular wooden case, painted black, that opens with two hings along one long edge.