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Bernard Stoneham signed up for the Mindme GPS locating device after his wife Gill, who has dementia, got disorientated near their home in Fishbourne, Chichester.
He says the device alerted him when his wife got lost while she was walking the couple's dog and without it "I wouldn’t have known where to look for her."
Mr Stoneham said: "If Gill gets into difficulty, she can speak to the staff through the device. They can then contact me or other nominated persons with her position.
"All I can say is how grateful I am to have had the use of this piece of hi-tech wizardry and what a difference it makes at this difficult time in our lives."
Age UK said the smart use of technology should be "encouraged" but ideally with the consent of those involved.
Hughes added that the society is working with organisations such as the Association of Chief Police Officers and the Missing Persons Bureau to ensure people with dementia feel secure and included in their communities wherever they live.
Police have defended their decision to buy GPS locating devices to trace dementia patients amid calls from some elder care campaigners for their withdrawal.
Sussex Police have bought six battery-powered locators as part of a bid to save money and time spent on searching for missing dementia patients.
The National Pensioners Convention described the introduction of the devices as "barbaric" and suggested sufferers could be stigmatised and made to feel like criminals.
But Sergeant Suzie Mitchell said: "The scheme is only costing Sussex Police a few hundred pounds but, comparing this to police time, resources, potential risk to the missing person, let alone the anxiety and worry for their family, it is, in my opinion, a few hundred pounds well spent."