I have used the Fisher F70 on the dry sand with the settings below please note these are the settings that I use when hunting on the beach dry sand, and the settings have been very successful.
[1] Disc: 20 no more than 30
[2] Sensitivity 75
[3] threshold: -3
[4] Tones: 2F
[5] Notch out: iron & foil
[6] Ground balance varies depending on your location of hunting on the sand
When working on any beach it is important to ground balance your detector often as the more you detect nearer the tide line the sand becomes richer in minerals and your detector will begin to chatter or chirp or whatever you want to call it, if this happens then you need to adjust your Sensitivity settings until the chatter or chirping dies down or stops it is very rare that I have needed to adjust the rest of the settings I have pre-set before any hunt on the beach, you will find when working on the beach if you walk even a few steps forward the ground balance will have changed due too the mineral changes within the sand SO KEEPING CHECKING THE GROUND BALANCE, it will surprise you how quickly the mineralization on the beach can change and this change can start your f70 to chatter or chirp...hope this helps
[1] Disc: 20 no more than 30
[2] Sensitivity 75
[3] threshold: -3
[4] Tones: 2F
[5] Notch out: iron & foil
[6] Ground balance varies depending on your location of hunting on the sand
When working on any beach it is important to ground balance your detector often as the more you detect nearer the tide line the sand becomes richer in minerals and your detector will begin to chatter or chirp or whatever you want to call it, if this happens then you need to adjust your Sensitivity settings until the chatter or chirping dies down or stops it is very rare that I have needed to adjust the rest of the settings I have pre-set before any hunt on the beach, you will find when working on the beach if you walk even a few steps forward the ground balance will have changed due too the mineral changes within the sand SO KEEPING CHECKING THE GROUND BALANCE, it will surprise you how quickly the mineralization on the beach can change and this change can start your f70 to chatter or chirp...hope this helps