Disc Setting
(2 bars)
Iron Cancel (tap)
Disc. Adjust (hold)
To enable Iron Cancel in either Beep or Zip mode, tap the Nail Icon. This will engage
the Iron Cancel feature at the default setting. You can adjust this setting up or down
by holding the Nail Icon, then using the Up and Down buttons to set the discrimination
range. Best practice is to only use what is required for smooth operation of the GMX, as
too high of an Iron Cancel setting will decrease the detector's sensitivity to small gold
nuggets. Again, this is a trade off - it is up to the operator to pick the balance between a
smooth threshold and maximum sensitivity. If you are getting a lot of high signals from
hot rocks, tap the LOCK button while in the Iron Cancel adjustment mode. This will
block out a range of signals from 94-99.
Please note that unlike coin detectors, the threshold will not go silent over discriminated
targets in the "Zip" (all-metal) audio mode. This is to ensure smooth operation and com-
bat ear fatigue. You may find that it is best to detect with Iron Cancel off, and then toggle
it on to check a target. Very small gold will often report a very weak target ID number,
or none at all, so this setting is best used as a last resort in only the most challenging
conditions.
Iron Cancel Adjustment
Iron Cancel (Discrimination)
When detecting for gold nuggets it is often
best to "dig it all." Gold can have various
shapes, sizes, be embedded in iron rock, so
it's impossible to account for every nugget
in the ground and only dig gold. However,
in challenging conditions the electronic
prospector may need to adjust the GMX
to cancel out unwanted targets or heavy
ground mineralization. This is done at the
expense of some sensitivity, but in extreme
conditions the amount of signals can over-
whelm your senses, causing "ear fatigue."
In these cases the real battle is in finding
good targets, not raw depth.
Situations where you might need to use
Iron Discrimination are: rapidly changing
ground minerals, high concentrations of
hot or cold rocks, old mining camps with
iron trash, highly variable ferrous ground
conditions.
GMX Controls
13