Turn your entire body as a unit until your predetermined azimuth falls under the fixed black index line. Read the value of the angle from the protractor. The azimuth of an object that is due North is 0 degrees, the azimuth of due East is 90 degrees, the azimuth of due South is 180 degrees, and the azimuth of due West is 270 degrees. Standards: Determined the grid azimuth (in mils or degrees) from your location (point A) to point B to within 1 degree or 20 mils. 3 0 obj<>>>/MediaBox[0 0 612 792]>> The most common unit of measure is the degree () with its subdivisions of minutes () and seconds (). 6. If the magnetic azimuth is less than 180 degrees add 180. Using the scale, determine the angle (grid azimuth). b. Align the 0- to 180-degree line of the protractor on the vertical grid line, while keeping the index in position. (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. c. Grid Convergence. The azimuth is the most common military method to express direction. Using a protractor, draw a line for the back azimuth on the map from the known position back toward your unknown position. An arc indicated by a dashed line connects the prongs for true north and grid north. A protractor is the most accurate way to determine a grid azimuth . This cookie is set by GDPR Cookie Consent plugin. This method is a little bit differently but can still accurately find your position. 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). But opting out of some of these cookies may affect your browsing experience. In land navigation the terms bearing and azimuth are interchangeable. (5) Draw a line on the map from your position on this grid azimuth. Ensure this line is at least two inches long to facilitate use of the protractor. f. The location of the user is where the line crosses the linear feature. (7) The intersection of the lines is your location. A glance at the completed diagram shows whether the given azimuth or the desired azimuth is greater, and thus whether the known difference between the two must be added or subtracted. Necessary cookies are absolutely essential for the website to function properly. Resection with straightedge. Ninety degrees corresponds to east, 180 degrees is south, 270 degrees is west, and 360 degrees and 0 degrees mark north. The 0- or 360-degree mark is always toward the top or north on the map and the 90 mark is to the right. Necessary cookies are absolutely essential for the website to function properly. Using your pencil, make a small tick mark on the map at the edge of the protractor at the desired azimuth. For bearings of 181 to 359 degrees, rotate the bezel clockwise. However, you may visit "Cookie Settings" to provide a controlled consent. On an azimuth of 1150 milliseconds, you move from point A to point B. Figure 6-11. However, where the intersection of the lines meet on the map is your location. (6) Move to a second known point and repeat steps 1, 2, 3, 4, and 5. This measured azimuth is the grid azimuth, and this measured azimuth is the drawn line. To convert degrees to mils, multiply degrees by 17.78. c. Grad. How many scales are on a military protractor? Calculate = = -22.97 51.50 = -74.47 . When an azimuth is plotted on a map between point A (starting point) and point B (ending point), the points are joined together by a straight line. Identify an end point on your map. eQK/E!),HZ7^}-9mPkB"SJBvU[O7$L&Wq3/CPV-u9Ik0j^fIJ2Aryb:m=^N DK|cE< The GMA on a map from 1998 is 3 and half degrees. All Rights Reserved. There are three base lines true north, magnetic north, and grid north. These cookies ensure basic functionalities and security features of the website, anonymously. using a protractor, you lightly draw the back azimuths from both known location on your map. Resection . Modified resection. RecPak is a meal replacement for the outdoors that saves you weight, space and time in the most challenging environments, just add water. This cookie is set by GDPR Cookie Consent plugin. Magnetic Azimuth. Azimuth determines which direction to take, while Elevation determines how high up in the sky you should look. b. Susan is 20 degrees off course. Our previous articles in the last week or so have centered upon getting back to the basics of land navigation. (d) To measure an azimuth, turn your entire body toward the object and point the compass cover directly at the object. At the end of this course, you will be able to determine grid Azimuth using a Protractor. (2) Locate and mark your position on the map. Analytical cookies are used to understand how visitors interact with the website. After identifying a far point, this will closely put you to where you are and then you can finalize your attack point and find your way. With a compass, how do you find azimuth? The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. A magnetic compass gives a magnetic azimuth; but in order to plot this line on a gridded map, the magnetic azimuth value must be changed to grid azimuth. how to determine grid azimuth using a protractor. How are azimuths used in a compass system? Is it easy to get an internship at Microsoft? 2 Draw a line between these points. For your convenience, you can use a UTM Universal Transverse Mercator AKA USGS 7.5 minute map. You are facing North if you stand in front of the compass and rotate your entire body with the compass until the North part is directly away from you. Especially from those who didnt get selected. The cookie is used to store the user consent for the cookies in the category "Performance". hTak0+VtHpfePAKcH`#IqIz;KYAA"&8$@,(.Q5{u>-q 1"ora-H>:PB6GDE]>>^M&i6)}}}qfWY@vk c. Determine the magnetic azimuth from your location to the distant known point. Grid Azimuth Step Action 1 Determine the start point and objective. 3) Choose your local time zone, caution: Mind to select the correct time (summer time vs winter) according to your chosen date. This circle is divided into 360 degrees or 6400 mils (Appendix G). Standards Determine the grid azimuth (in mils or degrees) from your location, point A, to point B, to within 1 degree or 20 mils. 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. Determine the grid coordinates to the desired accuracy . In this post, were going to look at the how and why of converting grid (or map) azimuths/bearings to magnetic azimuths/bearings and vice versa. Military personnel need a way of expressing direction that is accurate, is adaptable to any part of the world, and has a common unit of measure. Figure 6-13. 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). The following elements must be present when using polar coordinates (Figure 6-21). Determine the Grid Coordinates of a Point on a Military Map Measure Distance on a Map Convert Azimuths Determine Azimuths Using a Protractor Locate an Unknown Point on a Map and on the Ground by Resection Locate one's position on . Identify the map's starting point (A). b. Align the 0- to 180-degree line of the protractor on the vertical grid line, while keeping the index in position. The cookies is used to store the user consent for the cookies in the category "Necessary". (4) Draw a line along the straight edge. This protractor represents the azimuth circle. 4a. Mark . Barrett products are used by civilians, sport shooters, law enforcement agencies, the United States military, and more than 75 State Department-approved countries around the world. (1) To determine the grid azimuth (a) Draw a line connecting the two points (A and B). These cookies will be stored in your browser only with your consent. If you continue to use this site we will assume that you are happy with it. Convert the grid azimuth to a back azimuth. wills o' nats last of the summer wine. The Army uses two types: a. a. So, today well tackle a common issue for many candidates that find themselves on the land navigation course. The cookie is used to store the user consent for the cookies in the category "Analytics". (b) To use a magnetic azimuth in the field with a compass, first change the grid azimuth plotted on a map to a magnetic azimuth (Figure 6-11). Because you use north (0 or 360 degrees) as your base line, 270 degrees away from north will always be due west. Converting azimuths to quadrant bearings or vice versa is easy. Make a fist, with the back of your hand facing you. The cookie is used to store the user consent for the cookies in the category "Other. Around the edge of the protractor there are three scales; the outer is marked in mils, the centre is marked in degrees and the inner is marked in black azimuths. 3 Place protractor on the map, ensuring that it is correctly oriented (i.e., north on protractor corresponds to grid Can you overlay a compass on Google Maps? Identify the ending point (B) on the map. Other authors use a variety of slightly different definitions (i.e., angles of 180 and South = 0). Determine the grid coordinates to the desired accuracy. Hold your hand at arm's length and close one eye. In other words, this is just a format commonly used to indicate the direction of compass bearings. This was developed for the Center for Initial Military Training, FT Eustis, Va. This cookie is set by GDPR Cookie Consent plugin. 5. 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. Orient the map using your compass and terrain association. Subtract the calculated backsight reading from the original azimuth reading. *Lighting a path to truth* Former Navy JAG Worldwide U.S. Military Defense. 6-10. Identify an end point on your map. It also may be convenient to construct a G-M angle conversion table on the margin of the map. 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). You can use a map to determine a grid azimuth, or you can use a compass to determine a magnetic azimuth. Rotate the straightedge until the known position on the map is aligned with the known position on the ground. There are three methods of using resection, using the map and compass method, the straightedge method and the modified method. An azimuth is a special kind of geometric angle used chiefly in land navigation. On medium-scale maps, the declination information is shown by a note in the map margin. (f) The inclusion of the true-north prong in relationship to the conversion is of little importance. Magnetic North. a. 2282 0 obj <> endobj Convert the grid azimuth to a back azimuth. How do you find the azimuth, in the same way? 2296 0 obj <>stream Convert the grid azimuth to a back azimuth. Mark it as point A. The Army uses azimuths to express direction. 124. d. Convert the magnetic azimuth to a grid azimuth. To use your lensatic compass to find the direction of your intended azimuth (which you probably got from your map, using your protractor): 1. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. b. Using a protractor, draw a line for the back azimuth on the map from the known position back toward your unknown position. ?101rT$ > ` Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The line is your azimuth. Which is the military protractor GTA 5-2-12? Using the scale, determine the angle (grid azimuth). The declination diagram is used for these conversions. If the original azimuth is greater than 180 degrees you SUBTRACT 180 degrees from the original azimuth. The grad is a metric unit of measure found on some foreign maps. You use the right stick to press it. Determine the grid coordinates to the desired accuracy (Figure 6-17). To determine your GAZ, you should use one of these, known as a protractor. Using it is pretty simple: Place the center over the point on the map youre using to determine which azimuth youre going to travel on, square the protractor to the maps grid, place a small tick mark in the center of the protractor (they usually have a hole for that purpose), and use some sort of straight edge to line up the center point and the azimuth (use the INNER RING of degrees, not the outer ring), place a tick mark, move the protractor out of the way, and draw a straight line from the origin point to the azimuth line.