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Welcome to the Dauntless Aviation Glossary!
At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official,
and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies
to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including
our FAA written test prep and FAA practical test prep software and apps. If you like this glossary,
you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).
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Agonic Line
Agonic Line | | A line drawn on an aeronautical chart along which there is no angular difference between the magnetic and geographic north poles. | source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31) |
| | A line drawn on a map or chart joining points of zero magnetic declination for a specified year date. | source: FAA Flight Navigator's Handbook (FAA-H-8083-18) |
| | An isogonic line along which there is no magnetic variation. | source: FAA Helicopter Flying Handbook (FAA-H-8083-21A) |
| | An irregular imaginary line across the surface of the Earth along which the magnetic and geographic poles are in alignment, and along which there is no magnetic variation. | source: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25A) |
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Disclaimer: While this glossary in most cases is likely to be highly accurate and useful, sometimes, for any number of editorial, transcription, technical, and other reasons, it might not be.
Additionally, as somtimes you may have found yourself brought to this page through an automated term matching system, you may find definitions here that do not match the cotext or application in which
you saw the original term. Please use your good judgement when using this resource.
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