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I think you're after the magnetic variation. If so :- That is the variation between true north and the earth's magnetic field at your location. Can be + or - and up to a few tens of degrees.
Your compass does not actually point to north, though that is a useful assumption. In reality, the compass needle aligns itself with the direction of the earth's magnetic lines of force at your location. These do not run nicely north and south. Your map will have on it an indication of the magnetic variation in that region, and may include also the amount by which that varies annually.
The earth's magnetic field is generated (most of it anyway) by electrical currents flowing in the magma. These currents may be caused by the core rotating slightly faster than the mantle and crust. [But no one's been there!] The magma and the earths core beneath it are much too hot to sustain a magnetic field.
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What Operation to solve a true heading?
When converting a magnetic bearing to a true bearing then subtract any westerly variation or add an easterly one. The variation can usually be found on the chart, normally by the compass rose, plus the annual change
What does a compass symbolizes?
a compass sybolizes a dick
A state map has a circle-shaped compass. If the radius of the compass is 15 millimeters what is the approximate area of the compass (Use 3.14 for .)?
Area of compass: 3.14*15*15 = 706.5 square mm
Is y equals 2x plus 5 a direct variation if so what is the constant of variation?
No, it is not a direct variation.
How can you describe variation in a set of data?
measures of variation
