Which statement best describes lines of position when multiple references are used?

Which statement best describes lines of position when multiple references are used?

• A. They rely on a single reference.
• B. They only indicate distance traveled.
• C. They estimate the vessel's heading.
• D. They define possible positions from each reference; their intersection pinpoints location.

Answer: (D)

When you use more than one reference, each observation creates a line of position that represents all the places you could be given that reference. Plotting those lines on a chart gives you multiple candidate locations. The actual position is found where those lines intersect. Using several references improves accuracy because each line narrows the possible area, and their intersection pinpoints your precise location. So this describes why the best answer is that lines of position from each reference define possible positions, and their intersection pinpoints your location. The other ideas don’t fit: a single reference wouldn’t fix your position, lines of position aren’t simply distance along a track, and they aren’t used to estimate heading.

When you use more than one reference, each observation creates a line of position that represents all the places you could be given that reference. Plotting those lines on a chart gives you multiple candidate locations. The actual position is found where those lines intersect. Using several references improves accuracy because each line narrows the possible area, and their intersection pinpoints your precise location.

So this describes why the best answer is that lines of position from each reference define possible positions, and their intersection pinpoints your location. The other ideas don’t fit: a single reference wouldn’t fix your position, lines of position aren’t simply distance along a track, and they aren’t used to estimate heading.