Need a real fog horn.... – 100sounds + RINGTONES! 100+ Ring Tone Sound FX Review

I'm looking for a really deep, drawn-out, shipboard foghorn. The one I just downloaded sounds more like a diesel truck on the highway. I grew up in San Francisco and remember hearing the horn on the Golden Gate Bridge as a child. It was a real window-rattler!! Could we find something similar??
Review by CDR Pete on 100sounds + RINGTONES! 100+ Ring Tone Sound FX.