An apparatus comprising a first circuit and a second circuit. A compound of this kind is prepared more particularly by mixing at least one first precursor containing the titanium element with a +4 oxidation state, a phosphorus-based second precursor and an organic precursor containing the carbon element. Light directed to a fluorescent sample material disposed on the substrate causes light to be emitted from the sample. The preferred embodiment monitors the bandwidth consumption to determine what mode of transmission to apply, and in response, it can dynamically change between modes of transmission. A processor is operatively connected to the receiver and determines the location of the transmitter based on a multilateration calculation that includes the Time of Arrival of the transmitted signal at the proxy receiver and the known or calculated location of the proxy receiver as inputs.