Two companies have announced plans to launch personal GPS “location devices” this year, which will act as a kind of LoJack for everyone from meandering children to nervous executives in kidnap-prone countries.

One is a bracelet, which parents can lock on their kids’ wrists to track their location and movements over the Internet, that is made by Wherify.

Another — and the most sci-fi application by far — an implantable GPS device that Applied Digital Solutions of Florida plans to develop within the next eight months.