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Determine Azimuths Using a Protractor
071-510-0001


Conditions: Given a standard 1:50,000 scale military map with two known points plotted on the map, a protractor, a straightedge, and a pencil.

Standards: Determine the grid azimuth (in mils or degrees) from your location, point A, to point B, to within 1 degree or 20 mils.

Performance Steps
1.        The direction from one point to another, either on the map or on the ground, is called an azimuth. Azimuths are given in degrees or mils in a clockwise
direction from north, and all azimuths taken from a map are grid azimuths.
a.        An azimuth in degrees can be any number up to 360, since a circle has 360 degrees. Due East is 90 degrees, due South is 180 degrees, due West is 270
degrees, and due North is 360 degrees or 0 degrees.
b.        An azimuth in mils can be any number up to 6400, since a circle has 6400 mils. Due East is 1600 mils, due South is 3200 mils, due West is 4800 mils, and
due North is 6400 mils or 0 mils.
2.        The most accurate way to determine an azimuth from a map is to use a protractor. The Army uses two types.
a.        The square protractor (GTA 5-2-12) has two scales. The inner scale is a degree scale, and the outer scale is the mil scale.
b.        The semicircular protractor might or might not have two scales, an outer one in mils and an inner one in degrees. Each scale has two rows of numbers. On
both scales, the outer row is used to determine azimuths to the East of your position; the inner one is used to determine azimuths to the West of your position.
3.        The most accurate way to determine an azimuth from a map is to use a protractor. The Army uses two types:
a.        The square protractor (GTA 5-2-12) has two scales. The inner scale is a degree scale, and the outer scale is the mil scale.
b.        The semicircular protractor might or might not have two scales, an outer one in mils and an inner one in degrees. Each scale has two rows of numbers. On
both scales, the outer row is used to determine azimuths to the East of your position; the inner one is used to determine azimuths to the West of your position.
4.        Use the protractor properly.
a.        Plot the location of two points on the map.
b.        Using a straight edge, draw a straight line (azimuth line) from point A to point B.
c.        Place the index of the protractor at the point where the azimuths line crosses one of the vertical (North-South) grid lines. This procedure allows greater
accuracy in aligning the index line to a true reading where the azimuth line crosses the protractor scale.
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NOTE 1: The line drawn between the two points must be long enough to cross the scale(s) of the protractor in order to read the azimuth. Should the line between the
two points be too short to cross the scale(s), extend the line beyond point B until it crosses the scale(s).

NOTE 2: Ensure that the 0-degrees or 0-mils mark on the protractor is toward the top (North) of the map.
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d.        Start at the 0-degree or 0-mil mark on the protractor and read to the right (clockwise) until you reach the point where the azimuth line crosses the scale(s) of
the protractor.
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NOTE 3: Each tick mark on the degree scale is 1 degree, while each tick mark on the mil scale is 20 mils.
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e.        Read the azimuth where the azimuths line crosses the scale(s).
(1)        65 degrees.
(2)        65 degrees - 1150 mils.
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NOTE 4: You can read the scale all the way around the square protractor. On the semicircular protractor, point B is to the left (West) of point A. Reverse the protractor
so that 0 is toward the bottom of the map (South).
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Evaluation Preparation: SETUP: Provide the Soldier with a 1:50,000 scale military map, two points plotted and labeled (A) and (B), a protractor, a straightedge, and a
pencil.

BRIEF SOLDIER: Tell the Soldier to determine the azimuth from point (A) to point (B) within one degree or 20 mils.

Performance Measures        GO        NO-GO
1.        Determined the correct azimuth (within 1 degree or 20 mils).        ——        ——

Evaluation Guidance: Score the Soldier GO if all performance measures are passed. Score the Soldier NO-GO if any performance measure is failed. If the Soldier
scores NO-GO, show the Soldier what was done wrong and how to do it correctly.

References
Required        Related
FM 3-25.26        
GTA 05-02-12        
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