What is the primary method to obtain a chart fix if you do not use range and bearing?

What is the primary method to obtain a chart fix if you do not use range and bearing?

• A. Intersection of two lines of position from different references.
• B. A single line of position.
• C. A depth reading.
• D. An estimated position.

Answer: (A)

To fix your position on a chart without using range and bearing, you rely on lines of position from at least two independent references and find where they intersect. Each observation gives a line on the chart that represents all possible positions you could be given that observation. Plot two such lines from different references—like the bearing to two separate landmarks or two different celestial fixes—and the point where those lines cross is your charted position. A single line of position only narrows you to a path along that line, not a definite point. Depth readings don’t pin down horizontal position, and an estimated position is only an approximation. So the crossing of two independent lines of position is the correct method.

To fix your position on a chart without using range and bearing, you rely on lines of position from at least two independent references and find where they intersect. Each observation gives a line on the chart that represents all possible positions you could be given that observation. Plot two such lines from different references—like the bearing to two separate landmarks or two different celestial fixes—and the point where those lines cross is your charted position. A single line of position only narrows you to a path along that line, not a definite point. Depth readings don’t pin down horizontal position, and an estimated position is only an approximation. So the crossing of two independent lines of position is the correct method.