Marine 16 for a very short conversation. If go beyond 30 seconds, switch off to another channel. Scan the whole M list.
USCG uses ENC, that varies per sector.
LA County uses a trunked system, some some agencies have moved over like Lifeguards. The LA LB ports are between 2 counties. Check for a Couple trunked commercial systems used by private companies doing various work.
Check the RR database LA & Orange plus LA City.
Some ships are running out of supplies & being abandoned at various points along the route to destination.