Subtopic: Power efficiencies and measurement, engine performance curves
Question Statement:
If the departure and latitude of a line are 70 m and −130 m, respectively, then the whole circle bearing of the line in degrees is
Options:
(A) 28
(B) 62
(C) 152
(D) 208
Official Answer Key:
C
Step-by-Step Solution & Explanation
Departure (+70, east) and latitude (−130, south) place the line in the SE quadrant. Reduced bearing angle from south towards east: θ = tan⁻¹(|departure|/|latitude|) = tan⁻¹(70/130) = tan⁻¹(0.5385) = 28.30°.
For a line in the SE quadrant, Whole Circle Bearing (WCB) = 180° − θ = 180 − 28.30 = 151.7° ≈ 152°. Answer: (C).
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