Jumaat, 13 Mac 2009


•Utara benar/True North is toward the top of the map; it is defined by the meridians of longitude.
•Utara magnet / Magnetic North is the direction toward which a compass needle points within the map area.
•The angle between Magnetic North and True North is known as magnetic declination.- Sudut selisih magnet Because the magnetic pole shifts westward with time, the declination needs to be monitored and updated for accurate navigation

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