Sea fog is an old nemesis of sailors and aviators alike. I’ve worked coastal airports where the stuff would form offshore and then spread over the airfield. One minute, beautiful VFR. The next, hangars and runways were being smothered in mist.
On days like those, instrument approaches were the usual solution. However, we also got to use visual procedures designed for such situations. Special VFR was a big one. VFR on top was pretty common too.
