Any GPS locator/finder ideas?

My husband has DID and at night some times and during the day he has ended up walking out of the house. Being surrounded by 6 acres of woods and living in the country there are many places to go and the police don't consider you missing until 24 to 48 hours here. So... does anyone know of any good ideas of any GPS locators, watches, necklaces, chips... whatever might work that isn't too expensive.

If you have any idea of something you have heard of or used can you send me the name or the website where it's located? Thanks.
Proud mom of 25 kids under 10, 18 kids under 18 and friend to 94 ppl 19 - 43.

There is a thread about this topic in the Dissociative Identity Disorder Forum: Any GPS Locator Ideas?

In the new DSM-5 published in 2013 dissociative fugue no longer is considered to be a diagnostic category. It is considered to be a symptom. It is a rare symptom in dissociative amnesia and a common symptom in dissociative identity disorder (DID).

Thanks Una, I'll check it out.