they where really so deep ?? (garrett detectors)

[giuhalftrack]

I was reading about old detectors here:

http://www.treasurelinx.com/garrett.html

in the Garrett catalog of 1973 they advertise the coil they have made claim deep like this: (look at the image).
I know BFO detector can go deep(on larger objects) with a big search coil... but.. were they so deep or it is simple advertising ??

[Qiaozhi]

The detection depth they're claiming is for a huge metal target. So this is the absolute maximum detection depth possible for a particular coil size.

[junkhunter]

?

[giuhalftrack]

ok clear. The lack of dimension of the large object to detect is very misleading

[Qiaozhi]

ok clear. The lack of dimension of the large object to detect is very misleading

Yes - more misleading information to clarify some other misleading information.