NOVA: So we're 4,077 feet.
JACK: Well, that's MSL.
NOVA: MSL, what does that mean?
JACK: Mean Sea Level.
JACK: You're up here with a couple of fixed-wing pilots.
NOVA: OK, this is what I want to hear. Mean Sea Level meaning.....above sea level.
JOE: Above the mean level of the sea.
NOVA: OK, so it's obviously not 4,000 feet above the ground?
JOE: No, that's AGL, Above Ground Level.
NOVA: AGL is Above Ground Level. OK so...
Global Contenders '97/'98
Science of Ballooning
| Updated October 2000
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