Alfredo Contaldo · video

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Navigating beyond 12 miles requires solving four specific current-related problems to determine a vessel's true course and speed.Watch The first problem involves calculating the actual position after a set time when the vessel's heading and speed are known but a current is present.7:28 The second problem addresses how to maintain a specific track from point A to point B while compensating for a known current, which requires determining the necessary heading and expected arrival time.16:59 The third problem adds a time constraint, requiring the navigator to calculate the specific engine speed needed to reach a destination at a precise arrival time while fighting a current.26:55 The fourth problem involves identifying an unknown current by comparing the estimated position—based on heading and engine speed—with an actual GPS-derived position.40:12 These calculations rely on the "vector triangle" method, where the three inseparable pairs are the true heading and engine speed, the true course and effective speed, and the current's direction and intensity.4:07

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