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As the request is for the back azimuth, then what is wanted is the reverse (or inverse) of the azimuth, 223 degrees. In other words, an object moved in the direction of 223 degrees (Southwest relatively), but now the desire is to reverse the travel in order to arrive at the starting point. (That starting point would have to be Northeast relatively.)
One does not typically work with directions exceeding 360 degrees nor less than 0 degrees as that range is the range of a compass. Therefore, the back azimuth of 223 degrees, whatever it is, must be between zero and 360 degrees.
To determine the back azimuth all that is necessary is the knowledge that 1) the back azimuth is the opposite direction of the azimuth and 2) 180 degrees either added or subtracted will yield the back azimuth, and 3) the correct back azimuth must be in the range of zero to 360 degrees.
Given this knowledge and the variable definitions Ab = Back Azimuth and A = Azimuth,
Ab = A + 180
or
Ab = A - 180
But which equation yields the correct back azimuth?
Using knowledge point #3 above, the correct result will be the one that is between zero and 360 degrees. Therefore,
Ab = A - 180 = 223 - 180 = 43 degrees
is the correct back azimuth.
The other choice, Ab = A + 180 = 223 + 180 = 403 degrees, exceeds the range of the compass, so 403 degrees cannot be the correct back azimuth.
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What is the back azimuth of 168 degrees?
348 degrees. It is the exact opposite on a compass dial. 168 is 12 degrees before due south, so the back azimuth is 12 degrees before due north.
What is the back azimuth of 94 degrees?
Nominally 274 degrees. But on the real, spherical earth, the farther north you are, and the farther apart the two points are, the more the true back-azimuth will depart from 274 degrees.
How do you convert magnetic azimuth to grid azimuth?
To convert a magnetic azimuth to grid azimuth, subtract G-M angle.” If you have a magnetic azimuth of 270 degrees, and the G-M angle is 8 degrees, your grid azimuth will be 262 degrees.
To convert a grid azimuth to a magnetic azimuth you will need to know g-m angle. where would you look for this piece of information?
Declination Diagram
What is azimuth degrees?
An azimuth is defined as a horizontal angle measured clockwise from a north base line. This north base line could be true north, magnetic north, or grid north. The azimuth is the most common military method to express direction. When using an azimuth, the point from which the azimuth originates is the center of an imaginary circle . This circle is divided into 360 degrees or 6400 mils . NORTH IS 0/360 AZIMUTH EAST IS 90. SOUTH IS 180. WEST IS 270.
