The first and last legs of the Parallel Search (PS) have a ______ Spacing?

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Multiple Choice

The first and last legs of the Parallel Search (PS) have a ______ Spacing?

Explanation:
In a Parallel Search, you want the search swath from each leg to overlap with the swath from the next leg so nothing is left uncovered. The interior legs are spaced by the full track distance, but the first and last legs are offset by half of that spacing. This half-track offset places the outermost swaths to reach the boundary and overlap with the adjacent leg, ensuring complete coverage right at the edges. If the edge legs used full track spacing, the boundary areas could be left uncovered; other spacings would disrupt the intended edge overlap and complicate boundary coverage.

In a Parallel Search, you want the search swath from each leg to overlap with the swath from the next leg so nothing is left uncovered. The interior legs are spaced by the full track distance, but the first and last legs are offset by half of that spacing. This half-track offset places the outermost swaths to reach the boundary and overlap with the adjacent leg, ensuring complete coverage right at the edges. If the edge legs used full track spacing, the boundary areas could be left uncovered; other spacings would disrupt the intended edge overlap and complicate boundary coverage.

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