An ID’ing pass is like an arithmetic sum. Your short, slow coil pass may or may not be enough to produce an ID (or tone) on a deep, masked target. A small coil also increases this “ratio” of signal to noise in your favour. The Anfibio’s processing power “goes further” in relation to the masking.
Anfibio Dense Iron Methods (Excerpt)
… an important tool is to just slow the coil down as you make your ID’ing pass. What this does is it changes the ratio of the detector’s processing power versus the amount of data from the ground, iron and targets it needs to sort through in a given period of time.
So you have:
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-the slowness of your coil pass. (Gives the machine more time to do its processing job).
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-the width of your coil pass. (How much ground are you asking the machine to process in that time)?
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-your coil size. (The larger the coil the more “skewed” the ratio you are working against).
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-the processing speed of the machine. (3 Tone versus Deep mode for example).
…in relation to…
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-the depth of the target.
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-the amount (density) of iron and mineralization surrounding it.
The same “signal to noise ratio” principle can be used to acquire targets in dense iron–short, slow, even, controlled passes.
It’s not hard to see how high Gain settings can be a hindrance rather than a help for this kind of application–confounding this delicate process.
From: “Successful Treasure Hunting with the Nokta / Makro Anfibio Multi”
by Clive James Clynick (2020)