The correct answer is C) from every fix or running fix. The reasoning behind this is that according to Coast Guard regulations, a mariner holding a Captain's License must plot their dead reckoning position from every fix or running fix obtained during the voyage. This ensures that the vessel's position is continuously tracked and monitored, which is crucial for safe navigation, especially in coastal or confined waters. The other options are incorrect because: A) plotting only in pilotage waters would not provide a comprehensive track of the vessel's position; B) plotting every three minutes is too frequent and unnecessary; and D) plotting from every estimated position, rather than from actual fixes or running fixes, would not be as accurate or reliable.