My children grew up in a time when there were digital cameras and the GPS. They aren't, especially the younger two, impressed by technology neither are they concerned with how it works. No doubt the two younger ones would tell me that I'm "sad" but here's the experiment. Stand either side of the Rhossili-Port Eyon parish line and take photos of the gate across which the line runs. GeoTag the photos and upload to Panaramio