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As part of a project that uses UTM coordinates I am trying to find a formula to compute the angle (with sign) between the grid north and the true north. I understand this is called meridian convergence.

I am already able to get the correct easting and northing, but I cannot find a reference for a formula that would give me the angle given a single location.

I know that I can derive it mapping multiple points and computing then the angles between the lines that connect them as suggested, for example, here, but if possible I would like to avoid it.

Does such an equation exist?

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Federico
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1 Answers1

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After more extensive search I found this document.

At page 18/19 there is exactly the equation requested:

enter image description here

with the various parameters defined in the preceding pages.

Federico
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