Dead reckoning is the process of estimating a vessel’s current position by projecting its last known position forward using the speed, course, and elapsed time. Mariners rely on this method when GPS signals are unavailable or as a cross‑check against electronic navigation aids.
The fundamental relationship among speed, time, and distance is expressed by the simple triangle: distance equals speed multiplied by time. By knowing any two of these variables, the third can be derived, allowing the navigator to plan passages, estimate arrival times, and verify position fixes.
In maritime practice, speed is measured in knots (nautical miles per hour), time in hours, and distance in nautical miles. Maintaining consistent units ensures accurate calculations and safe navigation along coastlines and open waters.
How do I calculate distance traveled by a ship?
What is dead reckoning in maritime navigation?
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Why is dead reckoning important in maritime navigation?
What is the formula for calculating distance in maritime navigation?
How can I use this calculator to find my current position at sea?
What are the limitations of dead reckoning in navigation?
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