A new, state-of-the-art Computer Aided Dispatch system is up and running in Chatham County! What is Computer Aided Dispatch, or CAD? CAD is a system that acts as a hub for information coming into the E911 call center in an emergency. Using the newly implemented upgraded system, call takers will ask more detailed questions, which will take longer than usual. But that will help route first responders where they are needed more efficiently. “When they get enough information to actually get responde