Survival (SNS)

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Many guides don't have enough proficiency slots to take all of the suggested proficiencies at the onset of their careers. Once they've gone up a few levels and have earned an additional slot, the temptation is often to simply concentrate on their primary proficiency (Mountaineering, Navigation, etc.)
However, it is highly recommended that a guide take the Survival nonweapon proficiency after he fills all of his required proficiencies. Often a guide will find himself in a situation in which he has no food or water and must rely on himself. In such cases, the Survival nonweapon proficiency means the difference between life and death.
Remember, that each time a guide chooses the Survival proficiency, he must specify an environment. Well-traveled guides often purchase Survival proficiencies in areas other than their primary one. To do so, however, the guide must have spent a substantial amount of time in that particular environment. Otherwise, the DM is within his rights to deny the character the ability to use that specific proficiency.