non motion audio disc

HI GUYS
i have been reading about this mode getting more depth. i guess if you were to use it, it would be in a clean area free from allot of trash.

does any one use it, and how deep can you find coins ? useing a 9in. coil. and can it be used on a minerialsed site??

also is it easy to setup and keep stable, while in the field.



thanks bob