Before our recent trip with our DGS and DGD, we purchased the ID bracelets that they could wear on their wrists. Beside their names, we put our cell phone numbers on them, knowing we all had our phones with us. I can imagine your panic though as I had a similiar experience when I took our DGS over to the DCA Redwood challenge trail. It was after dark and my 1st time there (the DGS had been there several times during the week). He headed up the rope climbs and across the bridges in no time at all and was gone. I couldn't find him at all. After what seemed like forever, he came running back down the trail without a care in the world and really enjoying himself. It's tough being a parent or grandparent!