Coast Guard makes use of GenDyn communications system SCOTTSDALE, Ariz., Nov. 5 (UPI) -- General Dynamics C4 Systems says the U.S. Coast Guard has used its broadband Rescue 21 system in about 60,000 search-and-rescue operations since 2006. In a news release, the company said the Rescue 21 system has also been used in an undisclosed number of homeland security operations since 2006. Rescue 21 is a nationwide command, control and communications system that connects Coast Guard personnel with distressed mariners as far as 20 nautical miles out to sea. It is comprised of 253 towers and 32 command centers, and is interoperable with the communications systems of federal, state and local law enforcement and public safety organizations. When a distress call is received, the system automatically records it and simultaneously computes the callers' geographic location with direction-finding equipment. "In addition to being a life-line for millions of boaters, Rescue 21 is a model program that demonstrates how broadband technologies are improving maritime situational awareness, communication and collaboration among multiple government and law enforcement agencies," said Chris Marzilli, president of General Dynamics C4 Systems.