Question id 19 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

Preflight Preparation - (Refer to figure 6.) To receive accurate indications during flight from a heading indicator, the instrument must be
calibrated on a compass rose at regular intervals
set prior to flight on a known heading
periodically realigned with the magnetic compass as the gyro precesses.

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane