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Continue reading here: Magnetic Declination. %%EOF When Magnetic North lies to the west of True North, the magnetic declination is said to be westerly, and if to the east, easterly. hhKY__SJj oRdBe Grid Correction Angle. The University of Akron : YOU BELONG HERE! : The University Your current quad will be drastically differant from your 1950s quad. Here in the East it is about 7degrees west declination. Intersection, using a straightedge. I'll be doing it. Web(a) To plot a magnetic azimuth on a map, first convert it to a grid azimuth (Figure 6-13). A simple mathematical mistake could cause disastrous consequences. (c) Convert a magnetic azimuth when the G-M angle is greater than the magnetic azimuth (Figure 6-15). Basically, once you determine what your Magnetic Declination is, you simply use the provided tool, adjust the declination reading to correspond with that number (either East or West) and use your compass on the map as well as when shooting your azimuth. If you have a map and a compass, the one of most interest to you will be between magnetic and grid north. <>>> In either case, the listed Declination, or GM Angle on the map (which may or may not be correct due to Magnetic North Pole movement) is for the center of the map, and depending on the whats under or on top of the surface, the Declination degree may be distorted during your trip. kq_! Converting to a grid azimuth on a map. While the relative positions of the prongs are correct, they are seldom plotted to scale. WebTO CONVERT A MAGNETIC AZIMUTH TOA GRID AZIMUTH ADD G-M ANGLE 0-95 ro GIVE A STANDARD REFERENCE ON THIS SHEET TO NEAREST 100 METERS tifying 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. The bottom line is this. The degree scale is graduated from 0 to 360 degrees; each tick mark on the degree scale represents one degree. endobj *r\6}ZM{ru s/])7ZiV?.kBh%2`43`1(C`BE&q]I~u_ NB^'zNyv To convert a grid azimuth to a magnetic azimuth, subtract the G-M angle from the grid azimuth. Its a familiarity thing for me. Do you add or substance when converting a grid azimuth to magnetic azimuth in the westerly GM angle? (4) Draw a line along the straight edge. converting azimuth - magnetic and grid - YouTube (3) The G-M angle diagram should be constructed and used each time the conversion of azimuth is required. True North (geographic North) - based on the earth's rotation around its axis and is used to describe relative direction. Conversely, if its West, Magnetic North is West of your location. To convert this UTM Grid North direction to a True North direction, you must apply the grid convergence to the calculated UTM Grid North direction. It also includes some advanced aspects of map reading, such as intersection, resection, modified resection, and polar plots. YMMV. The Pennsylvania State University 2020, GPS and GNSS for Geospatial Professionals, Lesson 6: State Plane Coordinates and Heights, State Plane Coordinate Zones 1983, False Eastings and Scale, Lesson 7: Static Global Positioning System Surveying, Lesson 8: Real-Time Global Positioning System Surveying, Lesson 10: Global Navigation Satellite Systems and the Future, Repository of Open and Affordable Materials, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, John A. Dutton Institute for Teaching and Learning Excellence, Department of Energy and Mineral Engineering, Department of Materials Science and Engineering, Department of Meteorology and Atmospheric Science, Earth and Environmental Systems Institute, Earth and Mineral SciencesEnergy Institute, iMPS in Renewable Energy and Sustainability Policy Program Office, BA in Energy and Sustainability Policy Program Office, 2217 Earth and Engineering Sciences Building, University Park, Pennsylvania 16802.