Hi friends and J-P.
You're right from some aspects but from other aspects I oppose as I've experienced this these recent months.
We here found some 100% real treasure locations with our unique PI (MDL 8500) I think you've read about one of our locations I wrote about here:
http://www.geotech1.com/forums/showthread.php?t=14321.
the biggest one was being detected from 80-90 or maybe 100 meters and after hard work we found its' center. you see with a conventional detector we had problem to find the center, how expect of a LRL?
of course we went down up to 8 meters but some strange things(which makes some guys here laugh) happened and we had to stop (jinn that we have discussed little about it here:
http://www.geotech1.com/forums/showthread.php?t=12663)
on this point our other PI which is powerful but considerably weaker than MDL also gave strong signal which was unprecedented and overloaded in signal.
After that we found 2 other places with MDL, these locations were being detected from about 40-50 meters but other PI never gave signal over these latest; entirely silent. some gurus in weird sciences approved there are also armed with jinns like first location so we didn't dig those at all until find a potential guy to settle problem.
(oh, I know again some guys here laugh again but me personally for first time of my life experienced a jinn beat and still after 1 month I've sever ache in my ankle.)
Ok results; as you know I also made one PD (thank you for Morgan favors). I took it for all of these 3 locations to test its' workability. every time I set it very far from locations; maybe 500, 600 or 700 meters from locations and started to walk toward. for all of them PD reacted and became crazy over locations.
of course first signals appeared from more than 20 meters.
I checked this in different times and conditions, results were the same.
The points I noticed were ;
1- impossible to pinpoint carefully with such device over such locations.
if do, will surely have an empty hole.
2- assumedly we find such locations first with PD ( that is very appropriate for quick search or monitoring an area)or any other kind of LRL, if have not such unique PI, is impossible to find it. this approved me 100% it works but doesn't suffices.
especially over 2nd and 3rd location where other PI was silent.