A rescue coordination centre or RCC is a primary search and rescue facility in a country that is staffed by supervisory personnel and equipped for coordinating and controlling search and rescue operations.
RCC's are responsible for a geographic area, known as a "search and rescue region of responsibility" (SRR). SRR's are designated by the International Maritime Organization (IMO) and the International Civil Aviation Organization (ICAO). RCC's are operated unilaterally by personnel of a single military service (e.g. an Air Force, or a Navy) or a single civilian service (e.g. a national Police force, or a Coast Guard).
A Joint Rescue Coordination Centre or JRCC is a special type of RCC that is operated by personnel from multiple military services, civilian services, or a combination of military and/or civilian services.
A Maritime Rescue Sub-Centre or MRSC is a special type of RCC dedicated exclusively to organizing search and rescue in a maritime environment. A MRSC usually is subservient to a RCC and is used to take the workload for a particular geographic area within the SRR.