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Guards and Wards

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School abjuration; Level sorcerer/wizard 6, witch 6; Subdomain greed 6, home 7, wards 6

CASTING

Casting Time 30 minutes
Components V, S, M (burning incense, a small measure of brimstone and oil, a knotted string, and a small amount of blood), F (a small silver rod)

EFFECT

Range anywhere within the area to be warded
Area up to 200 sq. ft./level (S)
Duration 2 hours/level (D)
Saving Throw see text; Spell Resistance see text

By the way...
This spell can be cast on a ship.

Source Skull & Shackles Player's Guide