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Acid Fog

School conjuration (creation) [acid]; Level magus 6, sorcerer/wizard 6, unchained summoner 6; Elemental School earth 6

CASTING

Casting Time 1 standard action
Components V, S, M (powdered peas and an animal hoof)

EFFECT

Range medium (100 ft. + 10 ft./level)
Effect fog spreads in 20-ft. radius, 20 ft. high
Duration 1 round/level
Saving Throw none; Spell Resistance no

By the way...
The effects created by this spell do not move with a ship, but they do reduce the speed of a ship moving through them to half.

Source Skull & Shackles Player's Guide