I now have a GPS tracker round my husband's neck as well as his mobile phone in a pouch round his neck. He went missing for ten hours last week so I am hoping if this happens again we will be able to find him.
I try to go out with him all the time but he is quite determined and every now and again he is off.
My son in law tested it out with us and it seems efficient. Total cost about £200. No additional costs apart from topping up phone credit.