Astrolabe

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Source Adventurer's Armory

This device consists of a flat disc upon which two other discs are mounted. The mounted discs can rotate on a central axis, allowing them to spin and move as days pass. The bottom disc represents the latitude of the user; an astrolabe is useless if the user is outside the preset latitude. The upper disc represents the sky, and is filled with astronomical features. Anyone can be shown how to use an astrolabe at night to determine the date and time (which takes 1 minute).

Benefit: When using an astrolabe, you can make a Survival check using your Intelligence modifier instead of your Wisdom modifier to avoid becoming lost. An astrolabe grants a +2 circumstance on Knowledge (geography) and Survival checks to navigate in the wilderness (and on Profession [sailor] checks to navigate at sea).

The following additional/alternate information is from Pirates of the Inner Sea:

This device consists of a flat disc upon which two other discs are mounted. The mounted discs can rotate on a central axis, allowing them to spin and move as days pass. The bottom disc represents the latitude of the user; the upper disc represents the sky, and is filled with astronomical features. Anyone can be shown how to use an astrolabe at night to determine the date and time (which takes 1 minute).

Benefit: An astrolabe grants a +2 circumstance bonus on Knowledge (geography) and Survival checks to navigate in the wilderness (and on Profession [sailor] checks to navigate at sea).

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