White’s Electronics Goldmaster GMT - Manual (Page 25)

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coil till the message and "squawk" stop, you can
decide how large the target is and whether you wish
to dig it up to investigate. If you get the message
that the overload is from "Bad Ground", again the
audio and visual indication will be only momentary,
while your search coil is over the area which is
overloading the unit. If the indication is only brief,
you should probably just continue on searching. If
however, the message of Bad Ground repeats itself
frequently, you should probably heed the warning
and REDUCE GAIN.
VSAT Tricks :
Prior Goldmaster models did VSAT electrically.
The GMT is computerized, which gave White's the
opportunity to improve VSAT in ways which
weren't practical in the past. These improvements
"kick in" progressively at settings higher than 6,
allowing better ground silencing in highly variable
ground. At these higher settings, negatilve hot
rocks will sound "different" giving a "double blip"
sound or vanishing entirely, rather than giving the
"boing" sound you will get at lower settings.
Another difference between a gold nugget and a
negtative hot rock is that when you sweep back and
forth , the gold nugget will "stay in one spot" but
the negative hot rock will seem to keep wandering
around. This can also be the case with a pocket of
negative mineralization.
The more you use the GMT, the more you will
come to appreciate the very fast tracking which
allows you to work with little effort in the changing
ground mineralization where most gold is found
and also to appreciate the ability to eliminate much
iron trash without sacrificing depth or gold.
Chapter 5 GMT Searching