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(next)NOVA: So we're 4,077 feet. JACK: Well, that's MSL. NOVA: MSL, what does that mean? JACK: Mean Sea Level. NOVA: OK 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... (next) (previous) Global Contenders '97/'98 | Expedition '96/'97 | Fossett | Virtual Flight Science of Ballooning | Teacher's Guide | Resources | Transcript | Balloon Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated October 2000 |