Glossary
What is a sectional chart?
The visual navigation chart used for VFR flying, showing terrain and elevation, obstructions, airports, airspace boundaries and landmarks. Each one covers a named region of the country and is reissued on a published revision cycle.
Also called Sectional
That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.