3e SRD:Intuit Direction Skill
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Intuit Direction (Wis; Trained Only)
By concentrating for 1 minute, the character can determine where true north lies in relation to the character (DC 15). If the check fails, the character cannot determine direction. On a natural roll of 1, the character errs and mistakenly identify a random direction as true north.
The DM makes the character's check secretly so that the character doesn't know whether the character rolled a successful result or a 1.
The character can use Intuit Direction more than once per day. The roll represents how sensitive to direction the character is at that point in the day. Use the most recently rolled number for all other checks in the same day
Untrained characters can't use an innate sense of direction, but they could determine direction by finding clues.