Campbell Scientific CSAT3 CSAT3 3-D Sonic Anemometer - Page 54

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Appendix A. CSAT3 Orientation 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 value 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 positive 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 A-2

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Appendix A.
CSAT3 Orientation
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
value 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
positive 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
A-2