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- Q172 - Navigation Problems: Chart Plot
19. At 1239 your GPS indicates a position of LAT 36°55.2'N, LONG 75°33.1'W. You are on course 281° per standard magnetic compass at a speed of 9.2 knots. At 1318 your GPS indicates your position as LAT 36°54.8'N, LONG 75°39.8'W. What were the set and drift?
The set and drift were determined by comparing the dead-reckoned position with the actual GPS position. The current's direction (set) is 130T, and its speed (drift) is approximately 1.2 knots.
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