Question

which means and Communication share expended the field of communication ​

Answer 1

In search and rescue operations, consists of contacting all possible sources of information on the missing craft, including physically checking possible locations such as harbors, marinas, and airport ramps. An extended communications search is normally conducted after a preliminary communications search has yielded no results and when the mission is upgraded to the alert phase. Also called EXCOM. See also preliminary communications search; search and rescue incident classification

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