08/26/2026
Ever notice that a magnetic compass doesn't always point exactly where you expect?
The aircraft's electrical systems and metal components create small magnetic fields that can cause the compass to read slightly off. This is called magnetic compass deviation.
That's why every aircraft has a compass correction card. It shows the known deviation for different headings, allowing pilots to make the proper corrections and navigate more accurately.
Even with today's advanced avionics, understanding the magnetic compass, and knowing its limitations, is still an important part of being a safe pilot.
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