I have a new gtp1350 I have been to the beach,its ehh ok in the dry sand.... but I am having one heck of a time in the wet sand and shallow water.Now I was told to call garrett to findout if some chip for the salt waterwas put inmy machine..as its NOT working at all in salt water...I am talking low salt water..I have tried eveything from upping the disc. to lowering it....can someone help me...I am kinda disquisted with this on the beach...and I am still under two year warranty... help please.