Photo of GPS Navigation Devices is property of mroach
Here is a novel use of the GPS device - medical alarm which is 2 type of devices. One is in the form of a bracelet worn round the wrist. If you have an elderly person in your house suffering from Alzheimer's or dementia, they can wear the bracelet which is a mobile GPS alert and is also a speaker-phone (see photo below):
The mobile GPS tracking device cum speaker-phone will also be a source of comfort as you will be able to call the speaker-phone from any telephone if you want to check on any elderly under your care.
There is another useful device - the fall alert. If those under your care fall, the tele-assist call center will be alerted and they can send help immediately.