Search patterns • It may be advisable for vessels, especially when searching for a person in the water with either an expanding square search (SS) or a sector search (VS), to use dead reckoning (DR) navigation rather than more accurate navigational methods. It involves starting at the commence search point and running initial legs that increase in length by the track spacing with each 90 degree turn to the right. The document provided a summary of concepts from the IAMSAR manual, but did not contain details about specific incidents. Expanding Square Search. Rather than parallel lines, an expanding square is radiated from the Starting Waypoint according to the spacing between lines and at an angle selected for the Direction of Travel. Key patterns include the Expanding Square, Sector, Parallel Track, Creeping Line, Track Line, and Barrier Search, each selected based on factors like last known position, weather, and available resources. 3. Dec 29, 2011 ยท Finding an Item Using an Expanding Square There are a variety of underwater search patterns, each suited to specific conditions, but one of the more popular and easy to use is an expanding square search pattern. As an integral member of a SAR team it is vital that all Coastguard Crew are able to understand tasking instructions, and the requirements for setting up and carrying out a search. The length of the first leg should be about the easy range of visibility, 0.

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