Hello pilots I just got my phantom and turned on transmitter and then plugged in battery to phantom. It blinks like 3-4 green lights and then it just blinks yellow. I tried to do a compass calibration outside by flipping between GPS and ATT but it keeps just blinking yellow all the time. What am I doing wrong? Also how do you turn off the phantom once you land it back on ground. I don't see off switch for phantom.