What is the difference between "line of sight" and "line of position"?

The correct choice highlights that "line of sight" is defined as the direct straight line connecting two points, typically used in surveying and navigation to ascertain visibility or to establish a direct path for measurements. This concept is crucial in various surveying applications, as having a clear line of sight is often essential for accurate measurements, particularly in triangulation and when determining geographic coordinates.

In contrast, "line of position" refers to a specific location along which a person or observer is known to be. This term is often used in navigation and represents a series of possible locations along a line that could indicate the position of an object based on observations, such as bearings from landmarks.

Understanding this distinction is vital for anyone involved in surveying and navigation, as it emphasizes the difference between the concept of direct visibility and the broader potential location along which one might find oneself.