Campbell Scientific CSAT3B CSAT3B Three-Dimensional Sonic Anemometer - Page 74

CSAT3B Orientation

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Appendix A. CSAT3B 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 ° (the angle is East of True North, so it is reported as positive), 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.
CSAT3B 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
°
(the
angle is East of True North, so it is reported as positive), 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