My son and I recently purchased an Ace 150 and Ace 350 respectively. I thought it would allow us to spend somewhere great time together hunting for anything we could find. His first legitimate hunt the other day produced some trash but we actually found three coins (pennies) buried between 3-6". We are in the desert where digging can be a chore and I want him to have good experiences the first few times hunting. Any suggestions where I should take him just so he can learn? He and I are getting hooked on this. I appreciate any feedback.