You have a very good machine, but if you plan on hunting the wet sand in NJ, there will be some beaches where you will be digging iron nails and junk continuously. Especially after a storm. You will actually see the iron and nails on the surface. That doesn't say you won't find good targets too, it's just a VLF discriminating detector is preferred in those situations since you will dig a lot less junk and save time.
The double beep works on shallow iron...deeper iron no. And even then, some double beeps can be good targets.
When the weather gets better and you can hunt in the water ( don't do that tomorrow !), there will be less trash and dig all is the approach.
Since this is your first go round with it, I say dig all and have fun. Don't get discouraged though, when there is a lot more trash then treasure in your pouch. That is the way of the PI ( actually that is the way of the beach hunter)...especially hunting wet/dry sand. BUT...you may dig up a nice gold ring among all that iron because a VLF hunter walked over it due to iron masking and that puts you way ahead, fun and value wise.