(I am not certain, but there might also be a way to somehow track the iTrack with an iPhone. Then pulled them forward to mark the other end. Have to wear a bandaid for padding. The material used for the vest is very durable and soft, I normally have issues fitting around my chest area and this one was fitted in all the right areas. Connect to that, then you’re all set. These were the cheapest, yet they FIT THE BEST. I only went through so many because we used these for the field. True to size, Rocket Dog is a great brand. The womens flip-flops from Amazon basics have much narrower straps and thus provide less top of the foot support. From then on it was a poor excuse of a paper weight.