For those of you flying with the live, METAR weather, you've probably noticed that the altimeter is often off by hundreds or sometimes thousands of feet. To fix that, as in real life, you need to do one of two things:
1. Get the altimeter setting from the ATIS and put it into your altimeter -- this is the normal thing to do when you're airborne.
2. Change the altimeter setting until the altimeter reads the correct altitude -- this is the normal thing to do on the ground (but you need to cross-check with the ATIS if available).
A big part of flying cross-country in a real plane (below the flight levels) is adjusting the altimeter setting constantly throughout the trip. If you're IFR, ATC will tell you what altimeter setting to use at every handoff (it will be the one that everyone else in your sector is using, based on the largest airport in the sector); if you're VFR, it's up to you to call flight services or local UNICOMs as you fly to keep your altimeter setting up to date.
All the best,
David
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