Altitude/cold issues for iPhone 4?

I've had an iPhone for the past 3 years, and have updated this past weekend to the latest edition (4). I've been singing the praises of the phone at work for a few years now and have almost convinced my boss to get one. He just came into my office and we talked about this issue:
He's a mountain climber. He needs a new GPS, but has heard the iPhone has a GPS chip in it. His understanding is that the phone has GPS issues above 10,000 and below 32 degrees., He is subjected to both conditions on serious climbs. Is there an app that can help him despite the temps/altitude? Is the 10,000/32 just a rough number?
Any mountain climbers out there that can assist me?
Message was edited by: Gr8fulted

Well here are the specs about environment ranges for iPhone
Environmental requirements
* Operating temperature: 32° to 95° F
(0° to 35° C)
* Nonoperating temperature: -4° to 113° F
(-20° to 45° C)
* Relative humidity: 5% to 95% noncondensing
* Maximum operating altitude: 10,000 feet (3000 m)
Not sure how an App can alter any of that. A good case may but still face altitude issues.

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