Auxiliary Communications Service

 What Is ACS?

The Auxiliary Communications Service (ACS) is a group of specially trained communications volunteers managed by the San Diego County Sheriff's Department. These volunteers help provide communications support to emergency management agencies when there is a need for supplemental communications during planned events and emergencies.

Using Amateur Radio, public safety radio networks, and other communications systems, ACS volunteers are prepared to provide emergency auxiliary radio communications during disasters such as earthquakes, floods or wildfires. When the San Diego County Emergency Operations Center (EOC) is activated during these types of incidents, ACS provides communications support and works with the San Diego County Office of Emergency Services, the various cities in San Diego County, the American Red Cross, the Amateur Radio Emergency Service (ARES), the State of California Governor's Office of Emergency Services, and many other emergency management and disaster organizations.

ACS is the Radio Amateur Civil Emergency Service (RACES) organization for San Diego County Operational Area.

For more information about ACS, or how to volunteer, please visit


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