I just purchased a tesoro vaquero I live in pa and relic hunt for civil war items. The soil is really good. I don't want to dig a bunch of nails but I also want as deep as possible. The book is a good starter but getting info from fellow vaquero users is always better. I have been detecting for 20 years but getting a good starting point from previous users always helps in giving you an edge when tuning and setting up your detector. There's always tricks for getting better performance that the book never lists. thanks