There are others; I prefer the Map Tools Super GTA protractor. Figure 6-14. A declination diagram is a part of the information in the lower margin on most larger maps. A line from 0 to 180 degrees is called the base line of the protractor. Meridians converge on the surface of the Earth. 2 0 obj How to Convert Magnetic Azimuth to Grid Azimuth? - Civiljungle Web(a) To plot a magnetic azimuth on a map, first convert it to a grid azimuth (Figure 6-13). There are two methods of intersection: the map and compass method and the straightedge method (Figures 6-16 and 6-17). The computation of the grid correction angle or angle of convergence will require special mathematical techniques depending on the type of projection of the curved earth's surface on to the flat grid. b. This circle is divided into 360 degrees or 6400 mils . _k6 u7PO3+i_yF(igS|pVGXW~o6zom6 8bl_FP)T iN5;SIlw-KKwj{kLx!:E"Ux++syH9Fj- 5V -PY.f;!eOa$*^ TRdNb8ds)Rjn9TKT{y&wN4# g Converting azimuths with westerly G-M angle. With these three references it is a simple matter to determine whether declination and/or convergence need to be added or subtracted to switch from one system to the other. Using the laser range finder to determine the range enhances your accuracy in determining the unknown positions location. <> %PDF-1.4 (2) A typical note may read To convert a magnetic azimuth to grid azimuth, subtract. PM Milestone Project Management Templates, Toolface Orientation - Drilling Engineering. For mils, if the azimuth is less than 3200mils, add 3200 mils, if the azimuth is more than 3200 mils, subtract 3200 mils. Tipsy Tuesday: Cold Bow Challenge, Gear Reviews, And The Latest Hunting News! b. Mil. %%EOF Most of the declinations are listed on each USGS quad but from an accuracy issue they change so what year is your quad. You will find that every zone in a State Plane coordinate system has a central meridian. The most accurate method to determine local declination is to measure the magnetic field with a magnetic transit. The directional software packages will at minimum handle UTM and Lambert conformal conic convergence. Magnetic North. Back Azimuth and Backsighting hhKY__SJj oRdBe ^z].;@ UTM Grid North is said to be "X" number of degrees either east or west of True North. Do you add or substance when converting a grid azimuth to magnetic azimuth in the westerly GM angle? Who's going to be the first hunting 'celebrity' or Youtube personality to put their foot down and stop using cellular cameras? If you moved left you should add the angle between grid and magnetic; if you moved right, you should subtract. 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. In this example, the known azimuth is 270 magnetic. DIRECTION B181996 STUDENT HANDOUT - United States Magnetic readings are obtained with magnetic instruments, such as lensatic and M2 compasses.
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