Abstract: A very low frequency (VLF) receiver is provided. The VLF receiver comprises a magnetometer that detects a magnetic field, wherein the magnetometer comprises a rubidium gas cell. Processing circuitry receives an electrical signal representative of VLF electromagnetic signals detected by the magnetometer. A multi-axis array encloses the magnetometer. The multi-axis array comprises a number of inductive coils. A closed loop current controller is connected to the inductive coils and runs on the processing circuitry. The closed loop current controller controls the magnetic field strength of the inductive coils to maintain a uniform magnetic field across the rubidium gas cell to allow the processing circuitry to detect the VLF electromagnetic signals.

Abstract: A wearable apparatus includes a garment and a distributed electrical circuit. The garment includes a visible outer face directed away from a wearer and an inconspicuous inner face directed toward the wearer. The distributed electrical circuit inconspicuously integrated within the garment. The distributed electrical circuit includes a battery assembly, a microcontroller assembly, a memory assembly, a sensor assembly, a control assembly and a plurality of conductors arranged to interconnect the assemblies to form the circuit. A method of manufacturing the wearable apparatus is also provided.