compass motion error

compass motion error

[′käm·pəs ‚mō·shən ‚er·ər]
(navigation)
Errors in compass reading when the craft or vessel is under way; these errors are caused by northerly turning, speed acceleration and deceleration, the liquid in the compass swirling on turns, and vibration caused by engines; these are all random errors, and compensation is not attained in the simple compass.