Minelab GPX-4500, Instruction Manual

Page: 45 / 55

84 85 Pinpointing
Locating the Target
To find an object, and reduce the size of the hole
required to remove it from the ground, it is necessary
to pinpoint the exact location of the object.
If a target is heard, first confirm it by setting an
accurate Ground Balance away from the target. To
Ground Balance, if detecting in Fixed position, hold
down the Quick-Trak button and pass the coil around
the area of the target, making sure the target is not
detected (keep the coil well away from where the
target is). Once completed release the button.
If detecting in Tracking, move the coil slowly around
the area of the target keeping well away from the
target itself. Hold down the Quick-Trak button to go
to Fixed and pinpoint across the target.
Double-D Setting Monoloop (M) Setting (with DD coil)
Strongest Signal
To pinpoint a detected target sweep the general
area with the coil taking note of where the strongest
signal is received.
By shortening the length of the sweep it should be
possible to draw an imaginary line in the ground
where the strongest signal is located.
Line up the target at 90° from the initial direction
and repeat the process. The object is located where
the two imaginary lines cross.
Note: With the Coil/Rx switch set to Monoloop or
Cancel, when using a DD coil, pinpointing will not
locate a target in the centre of the coil; the target will
be slightly to the left. The left edge of the coil can be
used to pinpoint shallow targets.
Strongest Signal
Coil /
Rx
Cancel
Double D
M
Note: Accurate pinpointing
is also important to
prevent damage to the
buried object, which can
significantly reduce
it's value. Tip: If detecting on loose
dirt or gravel you can
actually draw the lines
using your shoe or pick.