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Page 10 The Minelab SD2100v2
7.5 Pinpointing
In order to save time in the recovery of an object and to reduce the size of
the hole required to extract it from the ground, it is necessary to pinpoint
the exact location of the object. The technique described here will be
particularly useful with the Double ‘D’ coil, but will also work with a Monoloop
coil.
When a likely object is detected, sweep the general area with the coil,
taking note of where the strongest signal is received. Raise and lower the
coil to one side of the target to make sure you are still ground balanced. If
necessary balance the detector again, then recheck the signal. If the ground
balance is accurate you may begin the pinpointing procedure. Decrease
the length of the sweep and it should be possible to draw an imaginary line
in the ground where the strongest signal is located (see Figure 7). Now,
move around the target and sweep the coil at 90 degrees to the initial
direction. Repeat the process of drawing an imaginary line. Where the two
imaginary lines cross is where the object is located.
If using a Monoloop coil, small shallow
nuggets will give a signal near the rim
of the coil. An alternative pinpointing
technique for Monoloop coils is to turn
the detector coil on its side and move
the coil while it is vertical across where
you suspect the target to be. This may
assist in pinpointing as shown in
Figure 8.
Figure 7 - Pinpointing Procedure
Figure 8 - Alternative Pinpointing