![]() N and the true South Pole, latitude of 90°Ħ-6. ![]() These magnetic poles are distinguished from the true North Pole, latitude of 90° The magnetic south pole is located at an approximate latitude and longitude of 68°Į. The magnetic north pole is located at an approximate latitude and longitude of 74° The earth, like all other magnets, has a magnetic north pole and magnetic south pole. This law of magnetism has meaning as you learn how the magnets in a ship's magnetic compass conform to this law in relation to the earth's magnetic field or to the ship's own magnetic properties.Ħ-5. Therefore, a north pole attracts a south pole but repels another north pole. If two magnets are brought close together, their unlike poles will attract and their like poles repel. If a single magnet is cut in half, each half becomes a magnet with a north pole and a south pole. Every magnet has a north pole and a south pole. The earth itself has similar properties and may be considered a gigantic magnet.Ħ-4. Such materials are lodestone and magnetic oxide of iron, which in their natural state possess this property. Permanent magnetism is the magnetism remaining for long periods without appreciable reduction unless the material is subjected to a demagnetizing force. Magnetism that is present only when the material is under the influence of an external field is called "induced magnetism." Residual magnetism is the magnetism remaining after the magnetizing force is removed. A magnet is a body that has the property of attracting iron and producing a magnetic field around itself.Ħ-3. To fully understand the operation of the magnetic compass, it is necessary to know something about magnets themselves. The magnetic compass will remain operative even when a ship is subjected to the following:Ħ-2. ![]() ![]() Despite the rising importance and great convenience of the gyrocompass, the magnetic compass still retains its importance because of its simplicity and reliability. It gets its source of power from the earth's magnetic field. The magnetic compass is one of the oldest items of navigational equipment. ![]() This chapter only covers dead reckoning and piloting navigation (along with their instruments and navigation aids). Navigation is divided into four subdivisions: dead reckoning piloting celestial and electronic. Navigation is defined as the art and science of safely directing the movement of a vessel from one position to another. Chapter 6 Dead Reckoning and Piloting Techniques ![]()
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