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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.

Given azimuths and a requirement to compute
back azimuths.

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


Performance Steps

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.

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
-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.


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

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

Performance Measures



Computed the exact back

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









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