I just lost ds1 see thread here and it was OK, but it was my worst fear come true. Also when he runs off there is simply no way of getting him back. He doens't answer to his name and although he does respond to 'stop'- he still needs me to be near him and firm before he will (and then it's only about 80% of the time).
I know several children who have escaped and been missing for hours.
I have seen trackers advertised recently- mainly in the NAS rag Communication. They look very pricey though. Not so much the unit- but the monthly cost of 20 quid - and I'm not sure ds1 would wear it anyway.
Has anyone used anything like this. I suppose I need something that I can activate an auditory alarm as well if he runs off so that I can hear it and find him.