Section 1. Preparation and Siting
1-9
Geographic
Alt.
CGM
IGRF Magnetic Field
Dipole
Lat.
Long.
(km)
Lat.
Long.
H(nT)
D(deg)
Z(nt)
Lat.
Long.
42.03
248.15
0.
49.80
311.06
20608.
14.417
50505.
49.68
312.14
Magnetic declination is bold in this example to show its location in the table. A
positive declination is east, while a negative declination is west. The
declination in this example is 14.417 degrees. As shown in Figure 1.4-1, the
declination for Logan, UT is east, so True North for this site is 360 - 14.417, or
345.5 degrees.
FIGURE 1.4-2. Declination Angles East of True North Are
Subtracted From 0 to Get True North
FIGURE 1.4-3. Declination Angles West of True North Are
Added to 0 to Get True North
Summary of Contents for ET106
Page 4: ...This is a blank page...
Page 20: ...Section 2 ET Tower Installation 2 6 This is a blank page...
Page 34: ...Section 3 ET Instrumentation Installation 3 14 This is a blank page...
Page 44: ...Section 5 ET Software Installation 5 2 This is a blank page...
Page 50: ...Section 6 Maintenance and Troubleshooting 6 6 This is a blank page...
Page 51: ...This is a blank page...