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Land Nav Task 16 - Compute Back Azimuths

Standards: Determined the back azimuth of a given azimuth to the exact degree or mils.

Conditions: Given azimuths and a requirement to compute back azimuths.

Standards: Determined the back azimuth of a given azimuth to the exact degree or mils.

 

Performance Steps

1.   Determine a back azimuth using degrees. Suppose you follow a 65-degree azimuth from point A to point B and then want to go back to your original location. To do this, you use a back azimuth. You simply add 180 to the first azimuth. Your back azimuth is 65 + 180 = 245 degrees.

2.   Determine a back azimuth using mils. You move from point A to point B on an azimuth of 1150 mils. Should you wish to return to point A, you would follow a back azimuth. To determine the back azimuth you simply and 3200 mils to 1150: 3200 + 1150 = 4350.

Note. The rule to remember to determine a back azimuth is as follows:
-Degrees: Less than 180 degrees, add 180 degrees. More than 180 degrees, subtract 180 degrees.
-Mils: Less than 3200 mils, add 3200 mils. More than 3200 mils, subtract 3200 mils.

Evaluation Preparation: 

Setup: Provide the soldier with azimuths, one in degrees and one in mils.

Brief Soldier: Tell the soldier to compute the exact back azimuths.

Performance Measures

GO

NO GO

     1.  Computed the exact back azimuth.

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

References

 

Required

Related

 

FM 3-25.26