When plotting a dead-reckoning (DR) position, what should you always start from?

When plotting a dead-reckoning (DR) position, it's crucial to start from a known position. This known position serves as the baseline for calculating your current position based on the vessel's course, speed, and time traveled. By beginning from a verified and accurate point, you can ensure that your subsequent calculations remain reliable and precise.

Using a known position allows for consistency and minimizes cumulative errors that can arise if plotting commenced from an estimated or incorrect position. In navigating, having a clear and confirmed starting point is essential for effective and safe travel, especially when considering influences such as currents or wind. As a result, initiating your DR calculations from a known position is a fundamental practice in navigation.