Ch 16 - 24-hour distress/emergency only broadcast monitored by the U.S. Coast Guard or dial 911.  The Port of Los Angeles Harbor Police patrol vessels monitor 
VHF channel 16.             

Los Angeles Port Police
"Sworn to Protect, Dedicated to Serve."
As one of few police forces in the nation dedicated exclusively to 24-hour port activities, the Los Angeles Port Police are responsible for patrol and surveillance of the Port of Los Angeles and neighboring Harbor Area communities. As California peace officers, the Port Police enforce federal, state and local public safety statutes as well as environmental and maritime safety regulations. Highly regarded among specialized law enforcement agencies, the primary goal of the Port Police is to maintain the free flow of commerce and produce a safe, secure environment that promotes uninterrupted Port operations.

Port Police Patrol
Los Angeles Port Police officers are responsible for enforcing all the laws and ordinances within the jurisdiction of the Port of Los Angeles, including its commercial operations, docks and marinas, recreational, residential and neighboring areas. Los Angeles Port Police Officers may also be involved with other programs such as participation in bicycle patrol, K-9, dive operations, sea marshal operations, detectives, or involvement in narcotics, cargo theft, or anti-terrorism task forces.

Tel: (310) 732-3500 (24 hours).  In the event of an emergency, dial 911.