Wiktionary
compass swing
n. (context nautical English) 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.
Usage examples of "compass swing".
At length I let go and watched the compass swing back on to the lubber lines of our original course.
On the control deck, Strong watched the needle of the astral compass swing around and stop dead on the course he had ordered.
He turned the plane around as best he could-too much cerebration again-and watched the needle on the compass swing around until it pointed at 270 degrees.