A water purification system having multiple soil layers is disclosed. The device is adapted to determine its location using GPS, report that location to a base station or directly to other such devices, receive the location of the other hunters from the base station or directly from other of such devices, and to warn the hunter when aiming his weapon in the direction of another hunter that is within an unsafe distance. The method may further include forming a buffer layer using second process gases comprising a second oxygen-containing gas and TEOS, wherein the first and the second process gases have different oxygen-to-TEOS ratio. The protection cover provides an attached state to be attached to the second cartridge and a detached state to be detached from the second cartridge. Communication between monitored individuals, monitoring agencies, databases, responding services, healthcare facilities and traffic controllers is integrated through the use of modern data and communication systems such as telephone, cable, wireless or the Internet. The VME includes a supervisory instruction emulator for emulating instructions.