essential
likely
maybe
probably not
Front (prompt)
MSL vs AGL — definitions and sectional chart rule?
Plain English (default view) — short, conversational, lightly seasoned with science
🔬 Scientific / formula (revealed on click) — markdown + $$…$$ ok
- **AGL** — Above Ground Level (height above terrain). - **MSL** — Mean Sea Level (absolute elevation). - On sectional charts: **all altitudes MSL unless in parentheses** — `(12)` means 1 200 ft AGL. - Add 00 to the printed number.
💡 Mnemonic / memory aid (shown on hover)
Parens = AGL. No parens = MSL. Always add 00. So 70/30 = 7000/3000 MSL; (12) = 1200 AGL.
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