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This is a child locator with voice. Accurate within 5 feet. Works with an app for a smartphone. $18/month.
What I haven't yet seen is something a bit more reprehensible, and it's related to the technology used in ankle bracelets for parolees. I believe that kind of tracking is more specific. However, I'm not aware that it's been adapted for elder use.
Your local Area Agency on Aging might have more current information.
There are also some more high tech devices that can link to a Smartphone and provide more accurate tracking, but I suspect that they're more expensive as well. I'm not sure as well whether they would require your husband's participation in sending data.
I'll check with the person who told me about this and update you when I get more information.
In the meantime, someone posted here sometime ago that they were able to get a device through the local fire department. It's something to check out.
If you want to do some research, google "wander management systems." There might be more advances that I'm unaware of.
Is there anyone staying with or caring for your husband while you're at work?