You can keep yourself and others safe and fed in the wild. The table below gives the DCs for various tasks that require Survival checks.
Survival does not allow you to follow difficult tracks unless you are a ranger or have the Track feat (see the Restriction section below).
Action: Varies. A single Survival check may represent activity over the course of hours or a full day. A Survival check made to find tracks is at least a full-round action, and it may take even longer.
Try Again: Varies. For getting along in the wild or for gaining the Fortitude save bonus noted in the table above, you make a Survival check once every 24 hours. The result of that check applies until the next check is made. To avoid getting lost or avoid natural hazards, you make a Survival check whenever the situation calls for one. Retries to avoid getting lost in a specific situation or to avoid a specific natural hazard are not allowed. For finding tracks, you can retry a failed check after 1 hour (outdoors) or 10 minutes(indoors) of searching.
Restriction: While anyone can use Survival to find tracks (regardless of the DC), or to follow tracks when the DC for the task is 10 or lower, only a ranger (or a character with the Track feat) can use Survival to follow tracks when the task has a higher DC.
Special: If you have 5 or more ranks in Survival, you can automatically determine where true north lies in relation to yourself.
A ranger gains a bonus on Survival checks when using this skill to find or follow the tracks of a favored enemy.
If you have the Self-Sufficient feat, you get a +2 bonus on Survival checks.
Synergy: If you have 5 or more ranks in Survival, you get a +2 bonus on Knowledge (nature) checks.
If you have 5 or more ranks in Knowledge (dungeoneering), you get a +2 bonus on Survival checks made while underground.
If you have 5 or more ranks in Knowledge (nature), you get a +2 bonus on Survival checks in aboveground natural environments (aquatic, desert, forest, hill, marsh, mountains, and plains).
If you have 5 or more ranks in Knowledge (geography), you get a +2 bonus on Survival checks made to keep from getting lost or to avoid natural hazards.
If you have 5 or more ranks in Knowledge (the planes), you get a +2 bonus on Survival checks made while on other planes.
If you have 5 or more ranks in Search, you get a +2 bonus on Survival checks to find or follow tracks.
The character can ignore the effects of terrain on movement and withstand even the harshest weather. If the character is capable of tracking, he or she can identify the races of creatures being tracked.
*Requires the Track feat.
Wherever the character is, he or she can determine the direction to a location on the same plane.
With a successful check, the character knows the direction to the desired location. This merely points the character in the direction of the location; it doesn't provide him or her with information on how to get there, nor does it take into account any obstacles in the path. 'Very familiar' represents a place where the character has been very often and where he or she feels at home. 'Studied carefully' represents a place the character knows well, either because he or she has been there often or has used other means to study the place. 'Seen casually' is a place that the character has viewed more than once, but which he or she has not studied. 'Viewed once' is a place that the character has seen once, possibly using magic. 'Description only' is a place whose location and appearance the character knows through someone else's description.
Source: SRD 3.5 Combined Skills