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- Q142 - Navigation Problems: Oceans
307. The great circle distance from LAT 38°17'N, LONG 123°16'W to LAT 35°01'N, LONG 142°21'E is 4330 miles, and the initial course is 300.9°T. Determine the latitude of the vertex.
The vertex latitude is calculated using the formula cos φv = cos φ1 sin A, where φ1 is the departure latitude and A is the angle between the course and the meridian at departure. Substituting the given values, the latitude of the vertex is approximately 4740.5'N.
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