Online Google Maps Compass Application

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Avoiding false readings when using a compass

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Keep the compass away from all metal objects since these can result in false readings by deflecting the magnetic needle.
Objects to avoid include wristwatches, keys, tables with metal legs or steel screws, mobile telephones and even heavy framed spectacles.
Many geological formations, and for that matter, many rocks, are magnetized and can affect compass readings, as can electricity power lines.