Search Effort in Searcher-Hours
What sweeping a segment actually costs: track_ft = 43,560 x acres / spacing, effort = track_ft / (mph x 5,280) in searcher-hours, and the team clock time = effort / searchers. A 160-acre segment at 40 ft spacing is 33 miles of track line - 22 searcher-hours at 1.5 mph, or 2.75 clock hours for a team of eight, before briefing, travel, and rest. Prices the spacing that search-track-spacing sets for a POD, so segments get sized to the resources. A planning aid, not a promise of coverage.
Formula and source
track_ft = 43,560 x area_acres / track_spacing_ft; searcher_hours = track_ft / (speed_mph x 5,280); team_clock_hr = searcher_hours / searchers.
NSARC / USCG search-planning practice (effort = area over spacing over speed), by name.
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