Which statement is most correct about nearly reciprocal LOBs?

• A. They do not cross, but the combined areas are reasonable to search.
• B. They always cross, creating a single definite search point.
• C. They indicate exact transmitter location.
• D. They are irrelevant to SAR planning.

Answer: (A)

When two lines of bearing are nearly reciprocal, the angular separation between the observations is about 180 degrees, so the two lines run almost along the same path rather than forming a clear cross. That removes a precise cross-point for pinpointing the transmitter. Instead, you end up with a long corridor where the transmitter could lie, defined by the two bearings and their measurement uncertainties. This still gives you a usable search area—it's a defined, elongated region to cover rather than an exact single point. The idea is that reciprocal LOBs constrain location to a corridor, not a precise spot, which is why this option is the most accurate.