Alfredo Contaldo · video

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To solve chartwork exercise 5.3.3-2 on chart 5D, a navigator must determine the compass heading (PV) required to pass 2.6 nautical miles off the Scoglio d'Africa lighthouse.1:19 The procedure assumes no external environmental factors like current or wind, allowing the true course (RV) to equal the true heading (PV).4:06 Using a compass and parallel rulers, the navigator plots a course tangent to a 2.6-mile radius circle centered on the lighthouse, resulting in a true heading of 184 degrees.4:06 The magnetic variation must be updated from 1994 to 2008 by applying an annual increase of 7 minutes east over 15 years, yielding a total variation of 2 degrees and 0.5 minutes east.6:01 Applying the conversion formula, the navigator subtracts the variation from the true heading to find a magnetic heading of 181 degrees and 55 minutes.8:11 Consulting the residual deviation table for the nearest magnetic value of 180 degrees provides a deviation of +3 degrees.9:08 Subtracting this deviation results in a final compass heading of 178 degrees and 55 minutes.10:05

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