FINDING GOLD , SILVERAND COINS WHITH THE MINELABE SOVEREIGNAND EXCALIBUR METALDETECTORS BYCLIVEJAMES CLYNICK i was told of this book by a forum member and got it it is great the man who wrot it has 30 years detecting experiance and has used all the soverign detectors and really knows his stuff if you are new this is a must uless you have the time to figure it out by yourself , the GT is not a hard machine this guy has insights that are truly amazing way more info than in the owners manual