For example, if your left line number is 17, the bottom line number is 48, and the triangle cutout tick marks read 12 on the bottom and 14 on the right, your 8-digit grid coordinate is 1712 4814. For example, if your left line number is 17, the bottom line number is 48, and the triangle cutout tick marks read 3 on the bottom and 6 on the right, your grid coordinate is 173 486.Ĭreate your 8-digit grid coordinate by reading the numbers that apply to the left and bottom lines of your grid square and the double-digit number on the bottom and right side of the small triangle cutout on your military protractor. You do not need a protractor to determine a 4-digit grid coordinate.Ĭreate your 6-digit grid coordinate by reading the numbers that apply to the left and bottom lines of your grid square and the single-digit number on the bottom and right side of the large triangle cutout on your military protractor. If the left line number is 17 and the bottom line number is 48, your 4-digit grid coordinate is 1748. The general rule of military map reading is "right and up," which means you read a military map to the right of each left border and upward from each bottom border.Ĭreate your 4-digit grid coordinate by reading the number that applies to the left line of your grid square and the number that applies to the line on the bottom of your grid square. When reading a military map, use the number along the left border of each grid square as your starting point then read the number along the bottom border. However, you can determine 4-, 6- and 8-digit grid coordinates. Generally, the military uses 8-digit grid coordinates. Locate your point, and count the number of tick marks on the bottom and the right side of the triangle cutout that correspond with your point.Ĭreate your grid coordinate by applying the appropriate numbers. Place the bottom right corner of the triangle cutout in the bottom right corner of the grid square and make sure the edges are flush. A military protractor is a sheet of clear plastic it is face-up when the numbers and letters stamped on it are readable and not backward. Make sure the protractor is face up, then place the triangle cutout of the protractor over the grid square in which you are located. Use a military protractor to determine the grid coordinates. For example, if there is a cliff to your right, a set of railroad tracks to your left and a river flowing in front of you, orient the map to match the direction you are facing and find those items on the map. Consult the legend on the map to determine your location. Use terrain association if you are physically located somewhere on the map and do not know your precise location. Locate the point on the map for which you need a grid coordinate. Railroads, two-lane highways, vegetation and bodies of water are some of the things identified on military map legends. The legend contains information on each topographic symbol used on the map. Buy now and pay at your pace using Zip Learn more. Military map legends are always in the lower-left margin. PROFESSIONAL USE - Inner protractor is marked in degrees and outer protractor is in mils MILITARY STANDARD - Equivalent to Graphic Training Aid 5-2-12 Coordinate Scale and Protractor (GTA 5-2-12), the standard issue Army protractor Pay with Zip. In this example, ∠ABD=120 and ∠CBD=60.Read the legend of the map. The center of your protractor will be at the. You will place the center of the protractor on the known point where you are plotting your bearing. Find the center point for your protractor. Some protractors are numbered in four 90° quadrants, and are a probably not a good choice for navigation use. Note that the middle letter denotes the vertex point of the angle.įor example, notice how in the diagram below that both angles ∠ABD and ∠CBD have point B as their vertex, but have different measures? Make sure you use the correct set of numbers. This complete guide on how to use a protractor includes several examples, an animated video mini-lesson, and a free worksheet and answer key.īefore we learn how to use the protractor tool to measure angles, let’s do a super quick review of angle notation (understanding this important skill will make learning how to use a protractor much easier).Īngle Notation: In geometry, an angle is denoted by the ∠ symbol and includes 3 consecutive letters which represent the three points that form the angle. Welcome to this free lesson guide where you will learn how to read a protractor and how to use it to measure angles.
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