Chart 1 : Symbols, Abbreviations and Terms

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Positions, Distances, Directions, Compass - Section B

Isogonic Lines

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Isogonic lines, Isogonals
Magnetic Variation Lines
The magnetic variation is shown in degrees, followed by the letter W or E as appropriate, at certain positions on the lines. The annual change is expressed in minutes with the letter W or E and is given in brackets immediately following the variation.

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