endobj Thank you for your replies guys! There is true north (the northern axis around which the earth rotates), magnetic north (the direction compasses point, which changes slightly every year) and grid north (the somewhat arbitrary point where all of your grid lines would converge if your map could extend all the way to the North Pole. grid azimuth Save my name, email, and website in this browser for the next time I comment. converting azimuth - magnetic and grid - YouTube %PDF-1.5 % A typical note may read To convert a magnetic azimuth to grid azimuth, subtract G-M angle. If you have a magnetic azimuth of 270 degrees, and the G-M angle is 8 degrees, your grid azimuth will be 262 degrees. This gives you a grid azimuth of 77 degrees. What north and how? xUM0#hWgK G!(l9Rq[L1yfzYjz`W^7]>o_vz{a}Kt;8X 9ngA>A))(&J%qWI H-5dEC{,O^fa< nY&j!5bA w}C|3nq{ceUxc0P }*%9M4.e$$""U rQ1md6G+ a :mB>8a/7Z's?9hd-VyH"a.9QEhd?SGq9~*OO.fM&:CEY) Converting to a magnetic azimuth on a map. Figure 6-13. Using the laser range finder to determine the range enhances your accuracy in determining the unknown positions location. (5) Draw a line on the map from your position on this grid azimuth. CR 98 JORDINATE CON Grid: Add 60 When magnetic results are recorded, the declination and the date must be included. 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). 9 0 obj<>>>/MediaBox[0 0 612 792]>> _:-"U-?Y E_t=++k A declination diagram is a part of the information in the lower margin on most larger maps. Figure 6-18. The grid north for a particular map is usually chosen so that it deviates very little from the true north]. If you are just navigating to hunt or recreate I would recommend not getting wrapped around the axle on this. (That starting point would have to Going from the known (line When using an azimuth, the point from which the azimuth originates is the center of an imaginary circle (Figure 6-2). To determine the back azimuth all that is necessary is the 2 0 obj WebAdd the GM angle to convert a magnetic azimuth into a grid azimuth. Azimuths Surveying | What Is Bearings Surveying DIRECTION B181996 STUDENT HANDOUT - USMC OFFICER (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. But which equation yields the correct back azimuth? On the State Plane coordinate grid, north is always parallel with the central meridian, but at the points on the Earth, north is along the meridian that passes through them.
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