I have a few questions I'm hoping someone can help me out with. I'm going to be getting the Garrett GTI 2500 and was wondering if it's the best to use if a lot of time is spent at the beach. I want a detector that's pretty good at detecting all types of treasure. Are these things pretty dependable? What about moisture? I'm also going to be searching trails, fields things of that nature also. And does anyone recommend detecting for a 7 year old? My daughter thinks she'd like it. And is the Treasure Hound search coil worth it?