JP 3-50 National Search and Rescue Manual Vol I - US Navy

Figure 5-21. Typical Assignments for SRUs
E. Outside the search area, lateral and vertical separation of
aircraft is provided either by air traffic control (ATC) agencies under
instrument flying rules, or by the aircraft themselves under visual
flying rules. Since control of air traffic by ATC in the search area is
usually not feasible because of low search altitudes, overall
responsibility for maintaining safe separation within the search area
rests with the OSC.
550 SEARCH PATTERN SELECTION
To ensure that the search area is uniformly searched, use of
standard search patterns allows the SMC to calculate probable search
effectiveness. This information is valuable for assigning SRUs, and for
planning future searches.
551 Factors in Selection
A. Search pattern selection depends on many factors, including
accuracy of datum, search area size, number and capabilities of SRUs,
environmental conditions, size of search target, and type of survivor
detection aids. While the factors are interrelated, some may be more
important than others. The SMC should satisfy the more important
factors while meeting others as nearly as possible.
B. The type and number of available SRUs are controlling factors
in selection of search patterns. SRU turning diameters, speeds,
detection capability, and navigational accuracy have a significant
impact on the uniformity of search area coverage and on POD. POD curves
are valid only when SRUs follow search pattern tracks accurately.
1. Surface Craft. Navigation accuracy of surface
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