![]() ![]() Pilots in the northern hemisphere remember this by the acronym ANDS accelerate north, decelerate south. The force is neutralized when the aircraft has reached its velocity and the magnetic compass will then read the proper heading. Also if the aircraft is decelerated the compass will show a false turn towards the south in the northern hemisphere and false turn towards the north in the southern hemisphere. However when the aircraft is turned to a new heading the following two rules apply for the northern hemisphere:įirst, when on an easterly or westerly heading and the aircraft accelerates, the inertia effect of the weight on the compass in the magnet causes the compass to show a false turn towards the north if in the northern hemisphere or vice versa a false turn towards the south if in the southern hemisphere. When in straight and level flight the effect of magnetic dip is of no concern. Compass navigation near the polar regions, however, is nearly impossible due to the errors caused by this effect. A weight is often placed on the compass of the aircraft on the equatorial side to help negate this effect. Magnetic dip is caused by the downward pull of the magnetic poles and is greatest near the poles themselves. ![]() As an aircraft flies closer to either pole the dipping error becomes more prevalent to the point that the compass can become unreliable because its pivot point has surpassed its 18 degrees of tilt. When the aircraft is at any altitude above the Earth's surface, the compass dial will tend to align itself with the geomagnetic field and dip toward the northern magnetic pole when in the northern hemisphere, or toward the southern magnetic pole when in the southern hemisphere. Neither do I think it is important in real life, but has anyone heard of this before and is it true?Ī second limitation is magnetic dip. It seems to me that if this was done it would exacerbate the ANDS error and I doubt that it is actually a practice, at least I have never heard of it. It refers to deliberately weighting a compass card to compensate for dip. ![]() Here is a Wiki article that a mate of mine learning to fly in the far north of the American continent showed me. ![]()
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