See relevant articles on the Alzheimer’s Society and Alzheimer’s Association websites:

https://www.alz.org/help-support/caregiving/safety/technology-101

https://www.alzheimers.org.uk/dementia-together-magazine/feb-march-2018/gps-device

https://www.alzheimers.org.uk/get-support/publications-and-factsheets/dementia-together/people-affected-dementia-try-gps-safer-walking-device”