Finally there is something that has occurred, in which I am actually an expert and qualified to give a real answer about.
I am a retired U.S. Navy Fire Control Technician, who is platform certified in the gun and missile systems on board Adams class guided missile destroyers, I have also worked with the Navy's Harpoon, Tomahawk and ASROC missile systems. (Fire Control Techs operate, maintain and repair the computer, radar and peripheral systems used to launch and guide the various naval weapon systems, we are the guys who "PUSH THE BUTTON")
Anyway, what I saw in the recent video concerning the object 30 miles off the coast of CA. Is blatantly a foreign made, Large Cruise or ICBM missile, being launched by a sub-surface aquatic platform. First I know its a large missile because it did not exhibit the typical "corkscrewing" trajectory of a beam riding missile as it tries to acquire the targeting beam. This tells me its a Big Boy with a complete guidance system installed in it, what is nicknamed a "fire and forget" missile, as once its launched its internal guidance system takes over and there is no real need for external guidance.