Plain English Meaning

A heading indicator that fixes itself. Instead of you having to reset it every fifteen minutes to match the magnetic compass, a small sensor mounted in the wing or tail constantly senses magnetic north and keeps the indicator pointed correctly on its own.

Full Definition

Heading indicators that are automatically corrected to magnetic north by a remote magnetic sensor (a flux gate or magnetometer), eliminating the precession drift that requires manual realignment in non-slaved gyroscopic heading indicators.

Context Anchor

Seen in instrument flying when using heading indicators, horizontal indicators, or other displays that show .