More depth at the salt beach
JimInPhilly, most likely hit the nail on the head with his answer.
You may be experiencing more depth at the beach, because the detector has to deal with far less mineralization on the sand, than it has to deal with on the dry land. The dry land can be/usually is, infested with various degrees of iron oxides, and other minerals to give fits to a discriminating detector. The salt areas on the other hand have had a long time to cleanse it?s self of the mineralization. This is most likely the ?why? of the increase in depth.
Another factor that I have noticed on a salt beach/water area, is that at times I feel the signal may be enhanced a bit because of the salts conductivity. I have never noticed this while using a discriminating detector, but is shows up using a
Pulse
Induction detector. It?s near imposable to duplicate this in any type of testing, if one moves the sand, it disturbs the ground matrix, this in turn changes the target response.
I hope this helps explain some of the reasons. I?m certainly no expert in these matters, just some info. I discovered along they way.
If I can be of further assistance, please feel free to contact me.
[email protected]
Mr. Bill
surfscanner.com