<P> The phenomenon is especially important in aviation, as it causes the airplane's compass to give erroneous readings during banked turns and airspeed changes . The latter errors occur because the compass card tilts on its mount when under acceleration . </P> <P> Compass needles are often weighted during manufacture to compensate for magnetic dip, so that they will balance roughly horizontally . This balancing is latitude - dependent; see Compass balancing (magnetic dip). </P>

Where on the earth's angle of dip is maximum