40
Figure 27: Mapping Multiple Targets
NOTE
To an experienced operator the shape of the mapped area can
indicate whether multiple targets may be present.
b. STEP 2 Determining the Centre of Target
The pitch of the Threshold Tone will rise or fall depending on the
combination of metals or the composition of metal in a mine. This
means that, in some instances, experienced operators may be
able to identify one mine against another (Figure 28).
By slowly moving the coil across the mapped area, it may be
possible to detect tonal differences indicating multiple targets.
**WARNING**
The volume from a large target may mask that of a small
target if the small target is located very close to the large
target.
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