my new x-terra 70. ok now how do i use it? ive had a quattro for 6 years.......to slow. so what is tracking? what does it do? i watched the dvd but didnt help me much. i would like 2 b a coinshooter BUT quattro wont let me. thats why i got me a 70, quicker i hear. where i detect is a crap load of iron out in the woods in N central PA. also what exactly is and DOES ground balance do? thank u much. im sure ill have more questions. but this is all i can think of rite now lol