a system and method is outlined for a wearable external device that communicates with a fully implantable miniaturized biosensor platform providing fast spatial detection and accurate assessment of the position and orientation of the implant within highly scattering tissue . the device and method provides spatial position , depth and rotational state of the implantable biosensor platform . the spatial position allows the ability to turn - on only one out of an entire array of leds that is in line - of - sight with the implant in order to conserve power . similarly , the depth and rotational coordinates information is used to adjust the output light intensity of the selected light emitters to compensate the power delivered to the implant . the above attributes render the system compatible for usage during intense physical activity and for added user comfort through improved skin ventilation .