CDI CD42-STS User Manual page 12

CD42-STS Subsea Diver/ROV Pig Location and Tracking System
NOTE: When the CD42-STS receiver is used in conjunction
with an ROV, the thruster motors will create large magnetic fields
that will interfere with the operation of the CD42-STS receiver.
It may be necessary to park the ROV periodically to create
a quiet electromagnetic environment for this system.
This is an unavoidable side-effect of all magnetic-based
pig location and tracking systems.
Electromagnetic fields are three-dimensional. A 3-dimensional rendering
of a typical Signal field might resemble this. (Note STS antenna
orientation parallel to pipe.)
Page 12 of 36