I recently purchased a new Vac and took it out for my first hunt here in Newfoundland to my surprise it seems our coins has a high percentage of steel in them. After setting the ground balance I turned the sens to the red, threshold at 1:00 o'clock I put the Vac into disc mode, laid a Canadian dine on the ground and couldn't even get as much as a chirp and the lowest disc setting, any thoughts or advice would be appreciated. Tin Can