obg, don't know how dialup handles pdf files, but if you go here: Coast Pilot 7 (1989) and scroll down to california etc you can peruse a historic coast pilot of the west coast from 1989 that i'm sure includes where you are. obviously there are updated versions of this, but it will give you an idea about what kind of info they have.

i was wrong. they don't appear to have fog horn data. at least for my area.