You could get a Footprint Tracker: it's actually a very small mobile phone worn on a lanyard, gives precise readout on map, automatically dials up to 3 preset numbers in turn if there is a fall (activated by sudden drop), has single button which dials presets in turn if pressed. It was invaluable for my father when he was at a stage where he still went out on walks by himself and often fell down. I could send someone to the precise spot where he was and keep him on the line. Purchase of the Footprint was not that expensive and it was £50pa for the service. It was so precise, I could tell whether he was in his room, in the dining room or in the garden of his care home at any time. I could also dial it, and it opened the mic automatically so I could speak to him.