In the late '80s, my dad recorded the foghorns of San Francisco on tape for my mother.  Many of the foghorns in San Francisco Bay can never be heard again as they have been replaced by more advanced technology. (Please read on)

Here is what my dad has to say:

This recording was made late in the evening on the foggy night of August 29th, 1987 from 
Lands End near Lincoln Park in San Francisco, using fairly inexpensive stereo equipment. The coordinates are approximately N 37 degrees 47' 14"; W 122 degrees 29' 40.5".  Years later I converted the recording to digital for posterity.  There are four separate fog horns audible, each with specific characteristics such as direction, intervals and frequencies; two are single, two are double.  I believe two of these are located on the nearby Golden Gate Bridge itself and another may be at Point Bonita on the Marin Headlands, 2.5 miles west of the bridge. Also audible is the surf below the cliffs of Lands End. At about 1:08:00
 into the recording a small plane can be heard flying overhead.  For more information about these and other fog horns in San Francisco Bay, visit:

http://goldengatebridge.org/research/factsGGBFogHorn.php

http://science.kqed.org/quest/audio/changing-foghorns/

1987 San Francisco Surf and Foghorns

If I didn't repost it, then how did it end up in your stream?

I live my life from one Josh Pan track to the next.

8ØHÐ

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