Answer to Question #20661 in Trigonometry for janus
S = √((67[knot])² + (12.5[knot])²) ≈ 68.156[knot].
Direction of the ship is
α = π + cos-1(12.5[knot]/68.156[knot]) ≈ 259°43'
(counting from the north as zero degree).
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