Sorry to disagree but there is ONE exception.
If you have a pointing dog the LAST thing you want is for that dog to come off point.
So, in the main, for working pointing dogs at least you need to know pretty well where your dog is so that if they don't recall straight away you know it is on point and you need to go find it.
One thing that does help is a bell attached to the collar, (they use these in France) but that in itself causes problems since normally you work a gundog without a collar (in case it gets caught on something). So it eventually comes down to a) have a damn good recall b) have a damn good idea where your dog is when you send it out - you can't always see them in the terrain you find birds, so you need to have sharp eyes and good instincts.