Consider the coordinates of two points A (EA, NA) and B (EB, NB BB)
The following relationship is used to calculate GAB :

Exercise n°1 :
Calculate from the formula the bearing of the following direction AB with:
A (10 ; 50) and B (60 ; 10) the lines SA whose lenght Dp the operator has measured. It reads the corresponding angle V, it measures Dp and deduces that :

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