italia458:
And when an airplane reaches OCN and has been unable to get further clearance from ATC, what is the pilot supposed to do?
It's a "paper" missed approach because the FAA cannot publish radar vectored missed approaches (except for ASR approaches) unlike the U.S. Navy in OKC465's example.
Having flown in and out of KCRQ many times over the years what happens when you miss the approach (and the tower is open), the tower says, "Maintain runway heading. Contact So Cal on 127.3"
When the tower is closed you remain with SoCal for the approach and any possible missed approach. I've never flown the approach when the tower is closed so I don't know exactly how it is handled then.
But, the track to OCN is a paper procedure.
Note the RNAV "Y" and RNAV RNP "Z" for the same runway. They go straight ahead to a holding pattern.