Disaster Emergency Communications is a specialized field within the broader field of emergency communications. Emergency communications or EmComm covers all technical means and modes for public safety agencies at all levels of government (e.g. law enforcement, fire services, emergency medical services) to perform their routine, daily communications. Amateur Radio operators can assist with maintaining operability and interoperable communications before, during, and after declared emergencies, disasters, or planned Special Security Events.
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References:
-http://www.cert-emcomm.net/
-Case study example