I recently been down to the beach with the sef butterfly 10 by 12 .three days in a row. with the mxt pro, It was set on salt , coin and than relic, the gain between 9,and 10 when that didn't work. I moved my gain up to 1,2,and 3 plus. my dual was set at each of it's arrows no luck. My machine works good. all i was getting was hot rocks. I couldn't find any junk. But on the other hand I walk across the two highway to the other side where the sand met the soil I was able to pick up all kinds of stuff like four sardines, a small bottle, and soda cans. Can someone tell me if that 12by10 coil works on the beach, or am I doing something wrong. mouseman