Jeff Head used the Cargo Vessel missile launch capability in his book series. The website below shows ships in specific areas of the world. We used this during the BOP spill. If I remember right there is a way to go back in time on this location site. Cannot find it now, but could not get it to work anyway when playing with it during the summer. Use World Map. Select the area near Los Angeles. There are only 157-158 ships there now. Most in ports. Most of those ships there live now off the coast have just been there within the past 12 hours or so. Would suspect if it was a cargo ship it would have launched under fog and probably on the out bound route. Unless of course a Cargo ship full of those missiles just docked in a So Cal port and may have had a mishap on the way in. But that sounds like an old 24 plot. If they have no clue however, they should at least be searching all docked ships that arrived last night.
Live Ship Maps