You lose the mills scale for artillery calls for fire and still have to draw extended lines on your map, cluttering and obscuring important details. Often hand trimming of the mils edge results in a sloppy, uneven edge cutting off degree marks. When measuring a grid angle from point A to point B on a map with the Army protractor, you are often forced to draw and extended line so you can reach the square's edge for a measurement! An improvement somewhat is to trim the mils scale off, but not a significant enough improvement. The RM protractor is round with degrees and mils scales on the outside edge. Army protractor (GTA 5-2-12) is a square shaped piece of clear plastic with mils scale and degrees on the outside edge of the square. Army SNCO, Rudy Madayag and offered in military clothing sales stores (MCSS) is far superior, easier to use and more accurate. The round and improved square map protractors produced by retired U.S. If the two counts are equal, the protractor is properly aligned.The current square issue map protractor ( GTA 5-2-12 ) is cumbersome to use, resulting in added time in planning, and inherently inaccurate resulting in map errors that can cause units to get lost and rounds to fall on friendly forces. Count the number of degrees from the 0-degree mark at the top of the protractor to this north-south grid line and then count the number of degrees from the 180-degree mark at the bottom of the protractor to this same grid line. (3) Note that the protractor is cut at both the top and bottom by the same north-south grid line. (2) The user should re-read the azimuth between the azimuth and north-south grid line to check the initial azimuth. The user should be able to determine whether the initial azimuth reading was correct. (1) Place the protractor index where the azimuth line cuts a north-south grid line, aligning the base line of the protractor directly over the intersection of the azimuth line with the north-south grid line. 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.
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