Two LOPs are not as good as three LOPs.

• A. Sometimes
• B. Not enough data
• C. False
• D. True

Answer: (C)

Lines of position constrain where you could be on the chart. Each independent LOP adds a constraint on your actual position. With two independent LOPs, you typically get a definite fix where the two lines cross. Adding a third LOP provides another constraint, which lets you check the consistency of the fix and, through methods like least-squares combining, reduce the overall uncertainty in your position.

So, the idea that two LOPs are never as good as three isn’t universally true. In practice, a third LOP usually improves accuracy or helps reveal and mitigate errors, though if the third line is faulty or nearly parallel to the others, it might not add useful information.