I have an old "fastracker" it is a model a rung lower on the ladder below the tracker iv. It works ok in shallow water at the beach, the coil is waterproof, keep the control box dry, don't lift the detector up so the coil is higher than the control box in case water runs down the stem and enters it. I carry a paintbrush with me, and when I finish I give the detector a shake to remove water, brush off loose sand and wipe it clean with a towel . I also find spray can furniture polish is good to spray on the stems so they slide together better, I try not to use petrol based lubricants as they can make plastics or rubber go brittle or break down. I think the tracker iv is a good start in detecting and you will find stuff with it, it is important to learn how to read the beach from books, or internet posts , recovery of the target is always the most tricky part in the wet sand , water. That is the area where I need more practise lol