CONVERTING BEARINGS Before converting a grid bearing to a magnetic bearing and vice versa, there are two things you must do: 1. Update the magnetic declination.

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Presentation transcript:

CONVERTING BEARINGS Before converting a grid bearing to a magnetic bearing and vice versa, there are two things you must do: 1. Update the magnetic declination on your map. 2. Draw a sketch of the norths and the bearing you are working with. a. Draw a zero line for Grid North. b. Plot the Magnetic North zero line east or west of Grid North depending on the declination. c. Plot a line clockwise from the appropriate North to represent the bearing. GRID MAGNETIC MAG. DECLIN. GRID BEARING 405.12 Silver Star OHP-1

CONVERTING FROM A GRID TO A MAGNETIC BEARING When converting to a magnetic bearing, you either add or subtract the magnetic declination, also called the grid magnetic angle (GMA). WEST IS BEST: When the GMA is west of Grid North, add it to the grid bearing. EAST IS LEAST: When the GMA is east of Grid North, subtract it from the grid bearing. 405.12 Silver Star OHP-2

CONVERTING FROM GRID TO MAGNETIC Easterly declination: Westerly declination: GB: 3200 mils Grid bearing: 1600 mils GMA 385 E GMA 420 W Magnetic Bearing?? Magnetic Bearing?? Mag. Bearing = Grid Bearing - GMA MB = 1600 mils - 385 mils (East is Least) MB = 1215 mils MB = GB + GMA (West is Best) MB = 3200 mils + 420 mils MB = 3620 mils 405.12 Silver Star OHP-3

CONVERTING FROM A MAGNETIC TO A GRID BEARING Converting from a magnetic to a grid bearing is done in the same manner, but with a few important differences. WEST IS LEAST: When the GMA is west of Grid North, subtract it from the magnetic bearing. EAST IS BEST: When the GMA is east of Grid North, add it to the magnetic bearing. 405.12 Silver Star OHP-4

CONVERTING FROM MAGNETIC TO GRID Easterly declination: Westerly declination: GMA 385 mils E GMA 385 W Grid Bearing?? MB 1954 mils MB 5465 mils Grid Bearing?? GB = MB - GMA (West is Least) GB = 1954 mils - 385 mils GB = 1569 mils GB = MB + GMA (East is Best) GB = 5465 mils + 385 mils GB = 5850 mils 405.12 Silver Star OHP-5