Having a right ballache trying to find drains in a field of mine. They seem to go all directions and new ones crossing over old ones, the map we have is pretty vague. I don't have the dowsing gift either. So been considering some sort of drain locator to go on to the drain rods. I read on here before about using terrier or ferret locators so any recomendations for what is good??? How do you attach to the rods? and What sort of range do they have in the ground?. Any advice very welcome!!