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b. STEP 2 Determine Centre of Target
In Step 1, the area of a target was determined. If the metal in the
target is sufficiently small, the area mapped will also be small and
therefore it is a relatively simple matter to pin-point the centre of
the target.
For larger targets, to determine the centre, the coil should be
slowly moved across the mapped area. As the coil approaches
the centre of the target, the threshold tone will increase to a
maximum volume (pitch may be high or low depending on the
composition of the metal). Where maximum volume is achieved,
the coil can be considered to be above the centre of the target.
Once confirmed, local Standard Operating Procedures should be
followed to mark the target.
**WARNING**
Extreme care must be taken when mapping the target to
ensure that the coil does not touch the ground (or any
exposed parts of the mine) or snag on any previously
undetected trip wires.
For large minimum metal anti-tank mines, it is possible
that the area mapped out may be less than the actual
area of the mine.
After an initial detection, if the coil is repeatedly swept
over a small deeply buried target, the response may
fade. If this occurs, move the coil away from the target
and perform an Audio Reset procedure (Section 6.3.b)
then return to the target location and continue with the
pin-pointing procedure.
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