A single line of position combined with a dead reckoning (DR) position results in what?

When a single line of position is combined with a dead reckoning (DR) position, the result is an estimated position. This is because the line of position represents a potential location based on navigational aids, while the DR position indicates where the vessel is estimated to be based on its course, speed, and time traveled. The intersection of these two methods provides a more accurate approximation of the vessel's actual position than either method could alone.

Using the line of position offers a reference point based on real-world navigational information, which helps refine the DR calculations. However, it's essential to understand that this combined position is still an estimation, showing a probable area where the vessel may be, rather than a confirmed or exact position. In contrast, a confirmed position would require more comprehensive navigational checks such as GPS information, while calculated drift pertains to the movement of the vessel due to external forces, and final destination refers to the endpoint of a voyage rather than a current location.