Cody,
I did not express myself very well about the behavior of the small search coil. I edited my post as follows:
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Edited
I meant to say that the 7.5" coil is not as accurate in the depth indication as the stock coil. Having said that, I am not particularly pleased with the depth indicator accuracy using the stock coil (especially for depths less than 6"). Like Cody, I pay much more attention to the loudness of the tone rather than the depth gauge.
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I am not questioning your statement about the 10" to 12" on the quarter with the small coil. I was just surprised. I have not used the small coil for over a year and a half. I was pleased with the performance of the small coil, but went back to the stock coil for greater coverage. I was perhaps mistaken in assuming that the smaller coil would not have as great a depth capability as the larger coil. While hunting inland I have not dug quarters as deep as 12" with the stock coil. But, I easily dig quarters at 12" with the stock coil at the beach.
Forgive me if I seemed too fussy.
HH,
Glenn