A wearable device (104-1, 300, 350, 610), comprising: (a) one or more environmental sensors (212, 214-1, 214-n, 312, 314a, 314b, 362, 612), wherein at least one of the one or more environmental sensors is configured for sensing a biometric signal corresponding to biological or physiological characteristics of a user; (b) a processor (202, 630); and (c) programming stored in a non-transitory medium, wherein the programming is readable and executable by the processor (202, 630), and (d) an emission source; wherein the programming performs steps comprising: (i) acquiring a biometric signal from the one or more environmental sensors (212, 214-1, 214-n, 312, 314a, 314b, 362, 612); (ii) acquiring position data, from the one or more environmental sensors, corresponding to a location of the one or more environmental sensors with respect to the biometric signal by identifying signal properties of the biometric signal and comparing the signal properties with a predetermined metric to determine how far away the environmental sensors are from an optimal placement; (iii) outputting a feedback signal via the emission source, during an initial placement phase, the feedback signal indicating a proximity of the one or more environmental sensors to the optimal placement as a function of the one or more signal properties of the biometric signal; and (iv) adjusting operation of the wearable device as a function of the acquired position data, wherein the feedback signal is an audible signal, the one or more signal properties of the biometric signal comprises a strength of the biometric signal, and an amplitude or frequency of the audible signal increases with the strength of the biometric signal indicating the proximity of the one or more environmental sensors to the optimal placement and the feedback signal is disabled after the initial placement phase. (a) one or more environmental sensors (212, 214-1, 214-n, 312, 314a, 314b, 362, 612), wherein at least one of the one or more environmental sensors is configured for sensing a biometric signal corresponding to biological or physiological characteristics of a user; (b) a processor (202, 630); and (c) programming stored in a non-transitory medium, wherein the programming is readable and executable by the processor (202, 630), and (d) an emission source; wherein the programming performs steps comprising: (i) acquiring a biometric signal from the one or more environmental sensors (212, 214-1, 214-n, 312, 314a, 314b, 362, 612); (ii) acquiring position data, from the one or more environmental sensors, corresponding to a location of the one or more environmental sensors with respect to the biometric signal by identifying signal properties of the biometric signal and comparing the signal properties with a predetermined metric to determine how far away the environmental sensors are from an optimal placement; (iii) outputting a feedback signal via the emission source, during an initial placement phase, the feedback signal indicating a proximity of the one or more environmental sensors to the optimal placement as a function of the one or more signal properties of the biometric signal; and (iv) adjusting operation of the wearable device as a function of the acquired position data, wherein the feedback signal is an audible signal, the one or more signal properties of the biometric signal comprises a strength of the biometric signal, and an amplitude or frequency of the audible signal increases with the strength of the biometric signal indicating the proximity of the one or more environmental sensors to the optimal placement and the feedback signal is disabled after the initial placement phase. (i) acquiring a biometric signal from the one or more environmental sensors (212, 214-1, 214-n, 312, 314a, 314b, 362, 612); (ii) acquiring position data, from the one or more environmental sensors, corresponding to a location of the one or more environmental sensors with respect to the biometric signal by identifying signal properties of the biometric signal and comparing the signal properties with a predetermined metric to determine how far away the environmental sensors are from an optimal placement; (iii) outputting a feedback signal via the emission source, during an initial placement phase, the feedback signal indicating a proximity of the one or more environmental sensors to the optimal placement as a function of the one or more signal properties of the biometric signal; and (iv) adjusting operation of the wearable device as a function of the acquired position data, wherein the feedback signal is an audible signal, the one or more signal properties of the biometric signal comprises a strength of the biometric signal, and an amplitude or frequency of the audible signal increases with the strength of the biometric signal indicating the proximity of the one or more environmental sensors to the optimal placement and the feedback signal is disabled after the initial placement phase.