Over most of the earth, a magnetic compass does not point to true (geographic) north; instead, it points at some angle east or west of true north. The angle D between magnetic north and true north is called the magnetic declination. Use Figure 10 to determine which of the following statements is true:

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D D (a) (b) >0 x dy lc dy A Note that the horizontal axis increases from right to left because of the way longitude is measured. Magnetic Declination for the U.S. D 50N 40N 30N A 15 10 10 5 B S -2 x -10 120W 110W 100W 90W 80W 15 (c) 70W > 0