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Obscuring Mist

School conjuration (creation); Level cleric/oracle 1, druid 1, magus 1, sorcerer/wizard 1, witch 1; Domain air 1, darkness 1, water 1, weather 1

CASTING

Casting Time 1 standard action
Components V, S

EFFECT

Range 20 ft.
Effect cloud spreads in 20-ft. radius from you, 20 ft. high
Duration 1 min./level (D)
Saving Throw none; Spell Resistance no

By the way...
The effects created by this spell do not move with a ship.

Source Skull & Shackles Player's Guide