Fisher Labs F4 Operating Manual page 19

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SEARCH TECHNIQUES
T
a
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T
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After detecting a target, do the
following:
1
.
1
.
Walk around the target in a
circle.
2
.
2
.
While
circling
continue
searchcoil across the target.
3
.
3
.
Sweep once every 30° or 40° of
the circle.
If the tone does not change
and the target ID value is
consistent as you circle the
target, you can be highly
confident
identification.
If the tone or target ID
changes as you circle the
target, you may have multiple
targets or an irregularly shaped
object.
If
the
disappears at different angles,
the target may be trash or a
low-value metal.
If you are new to the hobby, dig all targets. With practice in the
field, you will soon identify audible and visual target feedback with
certain types of metal objects.
P
i
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p
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t
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g
P
i
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p
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i
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t
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g
1
.
Sweep over target in narrowing side-to-side pattern
1
.
2
.
2
.
Take visual note of spot on ground where "beep" occurs.
3
.
3
.
Step 90° to the side of the target
4
.
4
.
Sweep coil over same area, at 90° to 1st sweep pattern.
5
.
5
.
This pinpoints the target location with an "X"
c
a
t
i
o
n
c
a
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i
o
n
the
sweeping
of
the
target's
tone
completely
p
r
o
c
e
s
s
i
n
m
p
r
o
c
e
s
s
i
n
m
(in DISC mode)
target,
the
COIL MOVEMENT
When swinging the coil, be
careful to keep it level with
the ground about 1/2 inch
from the surface. Never swing
the coil like a pendulum.
o
t
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o
n
m
o
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o
t
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o
n
m
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d
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WRONG
CORRECT
s
:
s
:
1
9
1
9

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