Totally agree with you malt where we can use locators but it's not always a lot of good a lot of what we do is on the South Downs and they are deep solid chalk warrens you have a job getting a purse net peg in the ground. You couldn't dig it with a jcb let alone a spade. Been doing this area for donkeys years never lost a ferret yet. But as said a locator is a must in most circumstances