Need your help on my new AT Pro!!!

[coinMD64]

Hello There, I purchased a new Garrett AT Pro metal detector last September. After assembling that At Pro,I tried to learn how to operate this in right way. I tried to do tests on my new AT Pro shortly after I got it from a fellow MDer through forum PMs. I already read the manual book on that AT Pro before I went out testing that detector. After struggling to operate this AT Pro, I gave up and put into my closet for few months until now. I already pulled my AT Pro out to do tests again last week. Yup I needs to re-read its manual book once again. Its VDI numbers are new to me. I need your help on operating AT Pro. I already upgraded from Ace 150. I used to operate old Garrett GTI series metal detector 20 years ago. I am gonna re-read the manual tonight!!! Any help on AT Pro would be appreciated!! Thanks!