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Measuring Loudspeakers Part One
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9. TRUE, MAGNETIC, AND COMPASS NORTH
www.marinenavigationbooks.comSwinging of the compass consists of measuring the compass deviations as a function of its heading throughout a full rotation of 360°, and then minimizing these deviations through the use of small adjustment screws marked N-S and E-W on the sides of the compass. This procedure is best left to professionals.