[pct-l] how altimeters work

[Postholer]

> (right now it says I am 70 feet bellow sea level and I am definitely not)

You just answered your own question, it doesn't self correct. By setting the 
altimeter correctly at least once a day from a known altitude, you also set 
the baseline for the barometer.

It works the same way in every aircraft big and small as well. Before you 
depart you set your altimeter to the field altitude (usually in the run-up 
area) or you can ask the tower for 'altimeter' and they'll give you a 
barometric pressure. An alitmeter in an aircraft is just like your watch, it 
has an altmeter reading and a barometer reading.

There you go!

-postholer

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