dip error
northerly turning error


Aircraft is turning right when on a northerly heading. The compass in this case lags and shows 330° when the aircraft is in fact on 000°. When the aircraft is initiating turn on a southerly heading, the compass leads in that it shows 150° when the aircraft is still at 170°. There is no such error when aircraft is turning through easterly or westerly heading. The compass needle catches up once the aircraft is level or when aircraft is passing through easterly and westerly headings.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved