Sector Search Pattern
When a single SRU is involved in a sector type search pattern, the designated as "VS". This type of search pattern is adopted when the search area is small, the location of the search object is well identified and when a deep concentrated search is required. This can be re-phrased, the sector type search pattern is used when
1. SRU has a good datum.
2. Used in restricted/small search areas.
3. The search object is small in size.
It resembles a spokes wheel with the datum being at the center. Also it is the only search pattern with the search area being circle. As the datum is established with a high degree of confidence, this method is employed where the search objects are difficult to search. The search units pass through the datum plenty times enabling to find out its location. During sector type search pattern, the SRU goes to the well known area where the search object is believed to be. This point is known as Datum (the center of the sector search). It is a practise to mark the datum with strobe light, life buoy, or an anchor buoy etc. The search usually starts with considering the direction of drift. If there is no drift, then first leg will be 000 degree true north, is considered as direction. The search starts with this course with the radius of the sector being one track spacing(S). The second leg will continue and the third leg will again meet at the datum to complete a sector of first search. The second search begins when the travel is from the datum to next complete sector. The distance between each search leg is 120 degrees and after 3 complete searches covering up the entire circle, the second sector formation starts by shifting the course 30 degrees from the datum. This again forms a sector to complete the sector type search pattern.
Thus we have seen the how to employ "Sector type serach pattern"..
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