1. An implantable system, comprising: an implantable medical device, suitable for implantation into a human body; a coordinate data interface, configured to receive coordinate data for the human body; a sensor, configured to detect at least one body signal from the human; a memory, configured to store coordinate data, for a defined location, from the coordinate data interface and the body signal data; and activation circuitry, configured to activate the implantable medical device in response to at least one of (i) the coordinate data and (ii) the body signal data.