(3) Note that the protractor is cut at both the top and bottom by the same north-south grid line. _____ 4) What is the method of intersection when a compass is unavailable? Magnetic Azimuth = 90 degrees True Azimuth = Magnetic Azimuth + Declination True Azimuth = 90 + (-15) = 75 degrees Figure 6 Example 2 Grid Convergence Grid convergence is an angle between True North and Grid North. A back azimuth is the opposite direction of an azimuth. GN 4 3 1. 11K views 8 years ago How to convert from a grid azimuth to a magnetic azimuth. %PDF-1.4 &n7n_n mI6C. Since 0 degree is the same as 360 degrees, then 2 degrees is the same as 362 degrees. (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. Draw an arrow for Magnetic North using an exaggerated angle east or west of True North showing the declination angle (east declination is east of True North and west is west). TERMINAL LEARNING OBJECTIVES 2. ENABLING On the left, at station D266, the convergence is minus 40.0 arcseconds. Do Eric benet and Lisa bonet have a child together? (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. There are several types of protractorsfull circle, half circle, square, and rectangular (Figure 6-5). 1790 0 obj <>/Filter/FlateDecode/ID[<2B0C2CAC99B5C942A1B86AECE94C0B5C>]/Index[1778 23]/Info 1777 0 R/Length 68/Prev 337901/Root 1779 0 R/Size 1801/Type/XRef/W[1 2 1]>>stream Do you have pictures of Gracie Thompson from the movie Gracie's choice? A method of locating or plotting an unknown position from a known point by giving a direction and a distance along that direction line is called polar coordinates. Add the GM angle to convert a grid azimuth into a magnetic azimuth. How do you convert magnetic bearings to grid bearings? To start, what is your goal? WebThe GM angle is used to convert magnetic azimuth to grid azimuth and vice versa: Grid azimuth - determined with a protractor and is measured from grid north. Declination diagram with arbitrary line. b. (e) Complete the diagram by drawing an arc from each reference line to the arbitrary line. When magnetic results are recorded, the declination and the date must be included. Most well proposals are generated from rectangular coordinates derived from the UTM or local grid system. 2296 0 obj <>stream Going from the Do you add or substance when converting a grid azimuth to magnetic azimuth in the westerly GM angle? To convert a magnetic azimuth to a grid azimuth, subtract the G-M Angle. Tipsy Tuesday: Cold Bow Challenge, Gear Reviews, And The Latest Hunting News! c. Determine the magnetic azimuth from your location to the distant known point. When an azimuth is plotted between point A (beginning) and point B on a map, it is called a grid. Once accurate magnetic declination and grid convergence angles are acquired, all that is needed to change reference systems is to add or subtract these angles from one another. WEST IS 270. Swarovski ATC Compact Spotting Scope Review, Helping Mule Deer Thrive: Muley Fanatic Foundation, Growing Big Mule Deer with Wildlife Prof Randy Larsen. All of them divide the circle into units of angular measure, and each has a scale around the outer edge and an index mark. Convert quadrant/bearing readings, including declination and grid convergence, to a 0-360 degrees azimuth system.

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