how to work out grid magnetic angle

To calculate the grid magnetic angle, you must first determine the deviation of magnetic North from true North. This is done by consulting a local magnetic deviation chart for your specific location. Once you have this deviation value, you can calculate the grid magnetic angle using the following formula:

Grid magnetic angle = True North – Magnetic North + Deviation

It is important to note that the grid magnetic angle can have significant implications for accurate navigation and mapping. Therefore, it is essential to ensure that all magnetic compasses and other navigational tools are equipped with the correct deviation value for your location.

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