Enter the two bearings:
Distance=km, Bearning=°
\(c^2 = a^2 + b^2 - 2ac\cos{(180+b-d)}\)
\(c = (2500.00)+(3969.00)-2.(50.00.63.00).cos(180+71.00-152.00)\)
\(c = 86.34 km\)
\(bearing = 117.11°\)