everybody digging to terriers should know how to locate them without a locater we done it for years as they hadnt invented them back then , i remember putting a russel to ground on a big sprawling earth on a slope about 7 am and we searched all day for that dog never heard a thing sank hole s poked and proded with the t bar nothing came back the next morning and put a dog on a rope sank holes every 8 foot that dog knew where to go but we couldnt here anything then about 5 pm we could hear faint baying so we tunnelled in about 10 foot guessed a mark with the add of the rope dog and sank another