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Appendix A. CSAT3 Orientation

A-2

Declination angles are always subtracted from the compass reading to find

True North. A declination angle East of True North is reported as positive a

value and is subtracted from 360 (0) degrees to find True North as shown

FIGURE A-2. A declination angle West of True North is reported as a negative

val

ue and is also subtracted from 0 (360) degrees to find True North as shown

in FIGURE A-3. Note that when a negative number is subtracted from a

ositive number, the resulting arithmetic operation is addition.

For example, the declination for Longmont, CO (10 June 2006) is 9.67°, thus

True North is 360° - 9.67°, or 350.33° as read on a compass. Likewise, the

declination for Mc Henry, IL (10 June 2006) is -2.68°, and True North is

0° - (-2.68°), or 2.68° as read on a compass.

FIGURE A-2. A declination angle East of True North (positive) is

subtracted from 360 (0) degrees to find True North

FIGURE A-3. A declination angle West of True North (negative) is

subtracted from 0 (360) degrees to find True North

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Campbell FW05 Handbuch Seite 54