The sensors self calibrate thru use. The mag calibration state can be seen visually if you go to settings->reticleos->ui and enable the compass in the status bar. Once that is on, the color of the circle in the center of the status bar will be red, yellow, or white. White is calibrated. To calibrate, take the glasses off, and move them around in a figure 8 for a while. This will do all 3 axises. Or, you can leave them on and just spin around like a break dancer. Doing this away from magnetic interference is a good thing too.