There is currently not an option for calibrating in a supine lying position. If all actions were to be performed in this position, it is possible to use the standing straight calibration while lying down. It is important to note that it may be difficult to find a clean calibration location while lying down. Also, it would not work if the subject then stood up to walk around. This would lead to muscular dislocation of the sensors and the data would be unusable. The movement of interest needs to be one in which the subject stays in an orientation similar to the calibration position.