The depth you mentioned is fairly easy to obtain by most machines. Of course I need one I have the option of in and out of the water. Next you have to consider whatās an acceptable loss for the targets you are looking for. You then may need to look at one with more coil options especially for working in trash as well as reducing sensitivity, slowing down, keeping the coil low ( not that I need to tell you this) and possibly using a pattern occasionally. In trash just changing it up occasionally can help. I found in say parks ā¦. Not running high sensitivity especially with a large coil seemed to pick up high conductors totally missed because the machine was trying to process so much material. Plus you got so much better TID. Go beach hunting I like an 11 or 12ā coil. But you lose some small gold.