20
Impact of sweep speed, ground mineralization, and
search mode
1.
Minimum depth
a.
Very slow or very fast sweep speed
b.
Highly mineralized soil
c.
Target I.D. search mode
2.
Average depth
a.
Moderate sweep speed
b.
Moderately mineralized soil
c.
Target I.D. search mode
3.
Maximum depth
a.
Moderate sweep speed
b.
Non-mineralized soil
c.
Autotune search mode
4.
Missed target
Many targets well within the range of your
CZ-21 will not be detected unless you overlap
your sweeps.
Figure 12.
Search coil
detection pattern.
1
2
3
4
SEARCHING ON LAND OR SHALLOW WATER
21
SEARCHING UNDERWATER
The CZ-21 is waterproof to 250 feet, and it operates the same
underwater as on land. Some differences in search technique
should be noted.
1.
Tune your CZ-21 underwater on the bottom as
instructed on page 6. Many divers prefer to use the
Autotune mode, in which case you may want to run
your threshold tone slightly higher than you would on
land. If you’re wearing a hood, you’ll probably have
to turn the volume control to maximum.
2.
Keep the search coil as far away from you and your
dive gear as possible. Sweep the search coil back
and forth in a wide semicircle in front of you to cover
the bottom in a methodical manner.
3.
Keep the coil parallel and as close to the bottom as
possible. Overlap your sweeps at least 50 percent.
4.
Recheck your ground balance every 5 to 10
minutes.
5.
Remember, observe all the rules of safe diving.
6.
Keep the search coil cable wound snugly around
the stem when diving around coral or jagged rocks
to keep it from snagging.
7.
Divers should make sure the drain holes in the
headset are unobstructed. Better yet, wait until
you’re on the bottom before putting your headset
on, and take it off before surfacing.
8.
Divers should also keep the search coil at least 2
feet away from their bodies. Metal gear (weights,
gauges, tanks, etc.) will be detected by the CZ-21
if held too close.
Figure 13.
Move slowly, keeping
the search coil away from your
dive gear and as close to the
bottom as possible
