Thanks guys for a response back on the floating coil I'll let shorty know, well I took the mx sport out for the first time in grand traverse bay the temp was 20 degrees or so ,hunted for an hour or so each time wasn,t sure how much cold the MX would take tried the trash program, the all metal and coin and jewelry modes stayed in coin and jewelry most of the time. It seemed to work fine in that weather ,l found a pendant gold looking but it was not in my pocket back at the truck ? definitely am going to need a close to real lake bottom test patch at home , l sold a mxt last year because of its noisiness , can,t be doing that again! This machine is super sensitive ,,especially for a at pro hunter. Well guys guess l better tell you what happened when l completely submerged it ! It released bubbles l think from around the clear top , not totally sure ? But it still worked fine and l din,t see water under the top . this is supposed to be the after September unit, is that normal please respond back. Gramps