Step 2 Determine Centre Of Target - Minelab F3 COMPACT Operation Manual

F3 COMPACT Operations Manual

4.5.2 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 pinpoint the centre of the
target.
To determine the centre, for larger targets, 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.
Figure 22: Determine target centre
NOTE
An operator can confirm that the centre of a target has been
located by moving the coil slightly in any direction, and returning
to the centre. In doing so the volume of the Threshold Tone should
decrease from maximum, as the coil leaves the centre, and return to
maximum as the coil returns to the centre.
Maximum Volume
32