i dont use locators just a call if they stay in to long ,i had a locator last year for a bit but waste of time really for me if you put time into your ferrets you shouldnt need one ,i do however see that they are good things for time saving etc lots of my mates use them when were out ,they get funny when i start calling mine up and they start digging haha just train them when there young to come to call and they soon get to grips with it i know its a bit old school but ferreting shouldnt be rushed