To obtain an accurate reading with the protractor (to the nearest degree or 10 mils), there are two techniques to check that the base line of the protractor is parallel to a north-south grid line. Distance does not change an accurately measured azimuth.įigure 6-7. 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). (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.

Military protractor home depot