compass swing
noun1
Nautical, Transport The process of swinging and compensating a ship or aircraft compass by determining and reducing the deviation coefficients and recording the residual deviations; now done by computer.
- This advisory circular (AC) describes procedures for calibrating an aircraft magnetic compass to minimize the effect of aircraft-induced magnetic fields. These procedures are often referred to as “swinging the compass” or a “compass swing.”2017, Federal Aviation Administration, “Standardized Procedures for Performing Aircraft Magnetic Compass Calibration”, in Advisory Circular, numbers 43-215, page 1: