Page 494 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition
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Geographic North
X
Geographic East
Y
X
18.2 Metal object detection 489
(a)
Z
Down
Declination
Z
Geographic North
Magnetic North
Inclination
Y
FIGURE 18.14
(b)
Down
(a) Geographic components of Earth’s magnetic field along with (b) vector components.
FIGURE 18.15
The Earth as a bar magnet.
Ng Nm
Sm Sg
Intensity
S
N
