I guess everyone is just running straight tracks?
This is what I do. Like Lisa, I make the first corners easy and more like a curve than 90 degree. When the dog masters that I gradually make them tighter.
From the beginning, I lay the straight part of the track in a way that will cue the dog to the fact that the track has stopped and is now headed in another direction. That has to do with the length of stride and how I walk. Once I make the turn tighter, my dogs will usually get to the corner and maybe pass by a neck and then indicate in some way that the track is not there. At that point, I praise the dog for indicating that and then encourage the dog to show me where the track went by saying, "where is it?". I hold the dog from making forward movement and once he finds which way the track goes, I praise him quietly again and allow him to advance down that leg. The reason I do this is to build drive and confidence on the corner vs making stress where the dog will get frantic and not be able to "think". Trials are different than training and for me, I want the dog's drive to go up a little when he gets lost .
Eventually, when the dog is really good at corners, I will jump off and start the track again about two feet from the corner so the dog has to look a bit harder for it. Same scenario where I hold the dog there if I need to but by then, I usually don't have to do that much.
I have used compulsion in years past and will still get on my dogs if they quit. However, I have not corrected my dogs on corners for years and years now. That is because I see so many dogs lose drive there and display all kinds of stress behaviors when I have walked with others on the track. I still remember one dog years ago. I was walking with the handler and the dog just barely passed the corner and then indicated that the track was gone. Whammo, big correction from the handler and the dog just sort of melted there. We had a little discussion and then laid another track. When he got to the corner and indicated, I told the handler to praise him, WHAT a difference in that dog. The body language was completely different and what had previously taken him about 30 seconds to find, only took about 3 seconds and he was on his way down the second leg. Even the handler could see it and while I am not being sarcastic, I will say I am constantly amazed at how much people do NOT see in their dogs when they are tracking with them. They also do not seem to realize that the dog is in a lower state of drive and therefore, the little things the handler does there has a much larger effect than the other two phases.
Ok, anyone else?