how to determine grid azimuth using a protractor

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A protractor is the most accurate way to determine a grid azimuth . Determine the grid coordinates to the desired accuracy. Without moving your protractor, take a pencil and find the corresponding north/south minor gridline by using the vertical side of the triangle. Author - Survival Magazine & News - Bushcraft Prepper Offgrid SHTF Blog . Theyre ok to use; theyre typically in 1:24,000 scale, and you need to ensure your map tools correspond in scale. The consequence of not converting or adjusting for declination is not reaching your objective..or worse, getting hopelessly lost, which might be terminal, depending on your location and the scenario you find yourself in. The conversion (add or subtract) is governed by the direction of the magnetic-north prong relative to that of the north-grid prong. radcliff ky city council candidates 2020 (5) Draw a line on the map from your position on this grid azimuth. Support Veteran Journalism . Calculate = = -43.18 0 = -43.18 . Identify the maps starting point (A). (1) To determine the grid azimuth (a) Draw a line connecting the two points (A and B). (3) Note that the protractor is cut at both the top and bottom by the same north-south grid line. With this in mind, the problem is solved by the following steps: (a) Draw a vertical or grid-north line (prong). Necessary cookies are absolutely essential for the website to function properly. No mathematical equation is necessary because the compass itself has the declination already accounted for by your adjustment. The north-south grid line is cutting the protractor at both the top and bottom. It is comparable to doing about face. To obtain a back azimuth from an azimuth, add 180degrees if the azimuth is 180 degrees or less, or subtract 180 degrees if the azimuth is 180degrees or more (Figure 6-3). Protractor. Modified resection is the method of locating ones position on the map when the person is located on a linear feature on the ground, such as a road, canal, or stream (Figure 6-20). The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Identify the maps starting point (A). You can find your PV systems azimuth by looking at Google Maps! Grid Azimuth Step Action 1 Determine the start point and objective. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Determine the grid coordinates to the desired accuracy. Be sure to line the protractor up properly, keeping the cross-center lines of the protractor parallel with the grid lines. And the W11156983B model number youve given isnt a model number. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is used to store the user consent for the cookies in the category "Analytics". (b) Place the index of the protractor at the point where the drawn line crosses a vertical (north-south) grid line. It explains the use of some field-expedient methods to find directions, the declination diagram, and the conversion of azimuths from grid to magnetic and vice versa. For now lets say youre using a USGI Lensatic or other compass that does not have the Declination Adjustment feature. the protractor on the vertical, north-south grid line. If you plot your grid azimuth on a map and it reads (for example), 180 degrees (GAZ), and you know your local declination is 15 degrees East, and you wish to convert your GAZ to a MAZ, simply subtract the Declination of 15 degrees and youll have a 165 MAZ, or magnetic azimuth that you can use with your compass. 3 Place protractor on the map, ensuring that it is correctly oriented (i.e., north on protractor corresponds to grid Its a familiarity thing for me. Determining a Grid Azimuth Using a Protractor There are two ways you can determine an azimuth. (1) When working with a map having an east G-M angle: (a) To plot a magnetic azimuth on a map, first change it to a grid azimuth (Figure 6-10). 2) Choose a date & time for your calculation. (1) To determine the grid azimuth (a) Draw a line connecting the two points (A and B). Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Because there are 360 degrees in the azimuth circle, the opposite direction would be 180 degrees from the azimuth (half of 360 degrees). Ensure this line is at least two inches long to facilitate use of the protractor. Ninety degrees corresponds to east, 180 degrees is south, 270 degrees is west, and 360 degrees and 0 degrees mark north. The inner scale is a degree scale, and the outer . 3 Place protractor on the map, ensuring that it is correctly oriented (i.e., north on protractor corresponds to grid Look down and read the azimuth from beneath the fixed black index line. Today, the reference plane for an azimuth is typically true north, measured as a 0 azimuth, though other angular units (grad, mil) can be used. There are two methods of intersection: the map and compass method and the straightedge method (Figures 6-16 and 6-17). For example an azimuth of 140 is greater than 90 and less than 180, therefore it is in SE quadrant. Theyre not essential for shooting an azimuth or bearing (from hear on out referred to as either a Grid Azimuth (GAZ) or Magnetic Azimuth (MAZ)), but they are very, very useful is plotting (determining) positions on a map to within various levels of accuracy (read distance from the actual object being plotted). Convert the magnetic azimuth to a grid azimuth. (7) The intersection of the lines is your location. However, you may visit "Cookie Settings" to provide a controlled consent. Remember, there are no negative azimuths on the azimuth circle. If a mistake is made and the reading is taken from the ending point, the grid azimuth will be opposite, thus causing the user to go in the wrong direction. Back azimuths are calculated as follows: If the original azimuth is less than 180 degrees you ADD 180 degrees to the original azimuth, thus an azimuth of 45 degrees (<180) will have a back azimuth of 225 degrees. With robust designs and vintage classic style, discover the heritage of military timepieces today! The Land Navigation course for SFAS also known as the Star Course in Hoffman, NC outside of Camp Mackall is the toughest individual land navigation course you will find in the U.S. military. In this example, notice that the quadrant bearing from point A to B is North 4 3 East (left map, using protractor) or an azimuth bearing of 4 3 . The width of your fist will approximately be 10 degrees. c. Using your compass, measure the magnetic azimuth to one of the known locations; change it to a grid azimuth (B, figure C-37.) This protractor represents the azimuth circle. When using an azimuth, the point from which the azimuth originates is the center of an imaginary circle (Figure 6-2). Convert the grid azimuth to a back azimuth. The terms azimuth and direction are interchangeable. To calculate the new Grid Magnetic Angle (GMA), multiply the maps age in years by the annual change (AC) and subtract this from the maps old GMA (OLD). On the map, draw a straight line connecting the two points. None of your azimuths need conversion until such time as you use a different compass one that cant be adjusted similarly. Place the index of the protractor at the point where the drawn line crosses a vertical (north-south) grid line. In some cases, there are no declination conversion notes on the margin of the map; it is necessary to convert from one type of declination to another. (1) With Notes. So, its good to check the on line or other sources for up to the date declination numbers. Draw a straight line on the map connecting the points, align the protractor to the map, and determine the value of the angle. d. Convert the magnetic azimuth to a grid azimuth. No special azimuth formula is needed, just a map, protractor, pencil and your start and end points. Follow your line outward to the degree scale of your protractor. Which is the military protractor GTA 5-2-12? (2) Locate at least two known distant locations or prominent features on the ground and mark them on the map. An azimuth circle consists of 360 degrees. If you continue to use this site we will assume that you are happy with it. By clicking Accept All, you consent to the use of ALL the cookies. An arc indicated by a dashed line connects the prongs for true north and grid north. Using a protractor, draw a line for the back azimuth on the map from the known position back toward your unknown position. The cookies is used to store the user consent for the cookies in the category "Necessary". If you have a map and a compass, the one of most interest to you will be between magnetic and grid north. What does the code CL mean on my Maytag washer. 260 180= 80. A visualization depicting the Soldiers Manual of Common Tasks (STP 21-1-SMCT) task Determine Grid Azimuths Using a Protractor (071-COM-0018). To determine azimuth, how do you use a protractor? (c) Examine the declination diagram on the map and determine the direction of the magnetic north (right-left or east-west) relative to that of the grid-north prong. Intersection is the location of an unknown point by successively occupying at least two (preferably three) known positions on the ground and then map sighting on the unknown location. e. Convert the grid azimuth to a back azimuth. The modified method is the least preferred and the least accurate method but is useful in certain situations. Illustration 1: The upper hemisphere of the celestial sphere. To convert degrees to mils, multiply degrees by 17.78. c. Grad. You will learn more about measuring angles later. This cookie is set by GDPR Cookie Consent plugin. It is used to locate distant or inaccessible points or objects such as enemy targets and danger areas. ^ni`H2pI35%S8lKXoboAJXT/k]3 @[J b. e. Applications. Place your protractor on the map with the index mark at the center of the known point and the base line parallel to a vertical, north-south grid line. The azimuth ranges from 0 to 360 degrees. (b) From the base of the grid-north line (prong), draw an arbitrary line (or any azimuth line) at a roughly right angle to north, regardless of the actual value of the azimuth in degrees (Figure 6-9). This method is a little bit differently but can still accurately find your position. requirement to determine the azimuth from. For mils, if the azimuth is less than 3200mils, add 3200 mils, if the azimuth is more than 3200 mils, subtract 3200 mils. P=KrbVC'nW_5tT_ZU)H]d,e*',"O 3m;[G!RrBVw'h>c,U[Q`N19+@9_SPV1~?wd7:nFDT;"50,&WHGU%s75'0jVx7V:w]_7X~,ZtetH It is imperative that all of these skills and they are the basics of finding your way in the field, become second nature to all of the candidates who aspire to be in the. Such procedure is important when working with a map for the first time. It determines the celestial bodys direction. 2. Step by step procedure for plotting with a protractor. The military protractor, GTA 5-2-12, contains two scales: one in degrees (inner scale) and one in mils (outer scale). In laymans terms, if you arent sure exactly where you are at and need to pinpoint your location and can see two or more distant points that are recognizable on your map sheet, you can shoot an azimuth to them and determine the back azimuth from those points to pinpoint your location. To express direction as a unit of angular measure, there must be a starting point or zero measure and a point of reference These two points designate the base or reference line. (Figure 071-COM-0018 1) Note: When measuring azimuths on a map, remember that you are measuring from a starting point to an ending point. Place the index of the protractor at the point where the drawn line crosses a vertical (north-south) grid line. Intersection, using map and compass. Grid north. You can use a map to determine a grid azimuth, or you can use a compass to determine a magnetic azimuth. How to determine azimuth using a protractor? Military protractor. Place the index of the protractor at the point where the drawn line crosses a vertical (north-south) grid line. (3) The G-M angle diagram should be constructed and used each time the conversion of azimuth is required. Youll be traveling several kilometers between points and the terrain is filled with thickets, swamps and low-level terrain where a hilltop on the map may look more like an anthill on the ground.