Definitions

1. noun

A device or system for measuring the compass error of a gyroscope or other navigational instrument, especially one used in aviation or space exploration.

“The precompass was essential for the astronauts to accurately navigate to the moon’s surface.”

2. verb

To adjust or calibrate a compass or navigational instrument to account for its inherent error or deviation.

“The pilot had to precompass the aircraft’s compass before embarking on the long flight.”