22
Note: The GPX Series are
‘motion’ detectors. This means
the coil must be moving
over the target, or the target
moving over the coil, in order
for the detector to ‘see’ it.
The GPX Series detectors will perform at their best when the
coil is kept close and parallel to the ground at all times. This
will increase the detection depth and target response
to small objects.
A variation in coil height at the end of each swing may cause
confusing sounds and reduce detection depth; an even flat
sweep is desirable.
Practise sweeping the coil over the ground in a side-to-side
motion, while walking forward slowly at the end of each
sweep. Slightly overlap the previous sweep to ensure full
ground coverage. An average sweep speed is four seconds
from left to right to left.
Tip: When using a Monoloop coil more overlap is required to
ensure that targets at maximum depth are not overlooked (see
p. 83 for a diagram showing coil search patterns).
Detecting Basics
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