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- Q163 - Navigation Problems: Chart Plot
61. Determine the course per standard magnetic compass from the entrance to Quonochontaug Pond (LAT 41°19.8'N, LONG 71°43.2'W) to the entrance to Great Salt Pond on Block Island.
The correct compass course is 159.0psc. This is determined by plotting the track, finding the true course, applying the chart's westerly variation as a negative value, and applying the standard magnetic compass deviation, also with the correct sign, using the formula C = T — (D + V).
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