Posted by Jill on Thursday, April 28, 2011 at 10:27pm.
"90 miles south and 20 miles east of port"
means the direction along which the ship must sail is:
x=-90, y=20
angle = atan(20,-90) = 180° - 12°-31'-44"
= 167°-28'-16" (in trigonometry notation).
To convert trigonometry notation to bearing, subtract angle from 90° or 450° if the angle exceeds 90°.
Bearing (clockwise from north)
= 450° - 167°-28'-46"
= 282°-31'-44"
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