I purchased a used Minelab Excaliber 800 a couple of weeks ago. The machine seems to work great. I found a '48 dime and a sterling silver ring already. I do a lot of land hunting and wonder if anyone has advice on proper discrimination in a trashy area. Also, any other tips would be greatly appreciated. I am not new to treasure hunting, but I am new to the Excaliber 800. Thanks in advance for any help! Happy Huntintg!!!