I'm thinking if getting a Whites PI Dual Field for primarily dry sand hunting. The beaches in my area have been pounded by hunters, all with VLF units and dual frequency detectors. I thought that maybe the dual field might pick up where they all have left off...........so I can get those deeper signals.Whites claims that the unit is designed to hit hard on gold. Someone told me that the design of the dual field coil is by Eric Foster..........any truth to this?Is anyone out there using the dual field in dry sand .....any tips?? Is it hard to pinpoint with this coil? Will the 12" coil be ok on smaller rings??Anyone on this forum using the Dual Field? I'm open to suggestions and value your opinions......thank you.