Safety, Fire & Survival · SAR — Search Patterns
The expanding square search pattern is used when:
- AThe search area is very large and the datum uncertain
- BSearching a coastline
- CThe survivor's position is known within close limits and a small area must be searched thoroughly✓ Correct
- DMultiple ships sweep abreast
Explanation
The expanding (growing) square is centered on the datum and is best when the position is fairly well known and the area small; it requires accurate navigation. Sector searches and parallel sweeps suit other situations.
Authority: IAMSAR Manual, Volume III
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